需求：实现一个在线预览pdf、excel、word、图片等文件的功能。 介绍：支持pdf、xlsx、docx、jpg、png、jpeg。 以下使用Vue3代码实现所有功能，建议以下的预览文件标签可以在外层包裹一层弹窗。
iframe标签能够将另一个HTML页面嵌入到当前页面中，我们的图片也能够使用iframe标签来进行展示。
"图片地址"</span></div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="2"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> style=<span class="hljs-string">"z-index: 1000; height:650px; width: 100%; margin: 0 auto"</span></div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="3"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> sandbox=<span class="hljs-string">"allow-scripts allow-top-navigation allow-same-origin allow-popups"</span></div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="4"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line">/></div></div></li></ol></code><div class="hljs-button signin active" data-title="登录复制" data-report-click="{"spm":"1001.2101.3001.4334"}" onclick="hljs.signin(event)"></div></pre> <p><strong>sandbox</strong> 这个属性如果是单纯预览图片可以不使用，该属性对呈现在 iframe 框架中的内容启用一些额外的限制条件。属性值可以为空字符串（这种情况下会启用所有限制），也可以是用空格分隔的一系列指定的字符串。</p> <ul><li><code>allow-scripts</code>: 允许嵌入的浏览上下文运行脚本（但不能创建弹窗）。如果没有使用该关键字，就无法运行脚本。</li><li><code>allow-top-navigation</code>: 允许将框架内所加载页面中的超链接导航到父级窗口</li><li><code>allow-same-popups</code>: 允许弹窗 (例如 window.open, target="_blank")。如果没有使用该关键字，相应的功能将自动被禁用。</li><li><code>allow-same-origin</code>: 如果没有使用该关键字，嵌入的浏览上下文将被视为来自一个独立的源，这将使 same-origin policy 同源检查失败。使用了这个属性，那么当前页面和iframe打开的页面视为同源。</li></ul> <h3><a name="t1"></a>word文档预览（docx）</h3> <pre data-index="1" class="set-code-show" name="code"><code class="language-javascript hljs"><ol class="hljs-ln" style="width:100%"><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="1"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line">先下载npm包</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="2"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line">npm i docx-preview --save</div></div></li></ol></code><div class="hljs-button signin active" data-title="登录复制" data-report-click="{"spm":"1001.2101.3001.4334"}" onclick="hljs.signin(event)"></div></pre> <pre data-index="2" class="set-code-show" name="code"><code class="language-javascript hljs"><ol class="hljs-ln" style="width:100%"><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="1"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"><div <span class="hljs-keyword">class</span>=<span class="hljs-string">"docxRef"</span>></div></div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="2"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> </div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="3"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"><span class="language-xml"><span class="hljs-tag"><<span class="hljs-name">script</span>></span><span class="language-javascript"></span></span></div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="4"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"><span class="hljs-keyword">import</span> { renderAsync } <span class="hljs-keyword">from</span> <span class="hljs-string">'docx-preview'</span>;</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="5"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> </div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="6"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"><span class="hljs-keyword">function</span> <span class="hljs-title function_">fn</span>(<span class="hljs-params"></span>) {</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="7"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"><span class="hljs-comment">// 这里的res.data是 blob文件流，如果自己的不是blob文件流</span></div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="8"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"><span class="hljs-comment">// 可以通过URL.createObjectURL(参数) 参数为File格式，转换为blob文件流</span></div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="9"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> <span class="hljs-keyword">let</span> blob = res.<span class="hljs-property">data</span></div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="10"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> <span class="hljs-keyword">let</span> childRef = <span class="hljs-variable language_">document</span>.<span class="hljs-title function_">getElementsByClassName</span>(<span class="hljs-string">'docxRef'</span>);</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="11"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> <span class="hljs-title function_">renderAsync</span>(blob, childRef[<span class="hljs-number">0</span>]) <span class="hljs-comment">//渲染</span></div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="12"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line">}</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="13"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"><span class="hljs-title function_">fn</span>()</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="14"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> </div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="15"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"><span class="hljs-tag"></<span class="hljs-name">script</span>></span></div></div></li></ol></code><div class="hljs-button signin active" data-title="登录复制" data-report-click="{"spm":"1001.2101.3001.4334"}" onclick="hljs.signin(event)"></div></pre> <p><strong>blob文件流</strong> </p> <p><img alt="" height="194" src="https://1000bd.com/contentImg/2024/03/15/082349122.png" ></p> <p>预览excel文件(xlsx) </p> <pre data-index="3" class="set-code-show" name="code"><code class="language-javascript hljs"><ol class="hljs-ln" style="width:100%"><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="1"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line">下载包</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="2"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line">npm install xlsx@<span class="hljs-number">0.16</span><span class="hljs-number">.0</span></div></div></li></ol></code><div class="hljs-button signin active" data-title="登录复制" data-report-click="{"spm":"1001.2101.3001.4334"}" onclick="hljs.signin(event)"></div></pre> <pre data-index="4" class="set-code-hide" name="code"><code class="language-javascript hljs"><ol class="hljs-ln" style="width:100%"><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="1"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"><div <span class="hljs-keyword">class</span>=<span class="hljs-string">"xlsxClass"</span>></div></div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="2"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"><span class="hljs-keyword">const</span> reader = <span class="hljs-keyword">new</span> <span class="hljs-title class_">FileReader</span>();</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="3"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"><span class="hljs-comment">//通过readAsArrayBuffer将blob转换为ArrayBuffer对</span></div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="4"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line">reader.<span class="hljs-title function_">readAsArrayBuffer</span>(res.<span class="hljs-property">data</span>) <span class="hljs-comment">// 这里的res.data是blob文件流</span></div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="5"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line">reader.<span class="hljs-property">onload</span> = <span class="hljs-function">(<span class="hljs-params">event</span>) =></span> {</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="6"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> <span class="hljs-comment">// 读取ArrayBuffer数据变成Uint8Array</span></div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="7"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> <span class="hljs-keyword">var</span> data = <span class="hljs-keyword">new</span> <span class="hljs-title class_">Uint8Array</span>(event.<span class="hljs-property">target</span>.<span class="hljs-property">result</span>);</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="8"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> <span class="hljs-comment">// 这里的data里面的类型和后面的type类型要对应</span></div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="9"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> <span class="hljs-keyword">var</span> workbook = <span class="hljs-variable constant_">XLSX</span>.<span class="hljs-title function_">read</span>(data, { <span class="hljs-attr">type</span>: <span class="hljs-string">"array"</span> });</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="10"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> <span class="hljs-keyword">var</span> sheetNames = workbook.<span class="hljs-property">SheetNames</span>; <span class="hljs-comment">// 工作表名称</span></div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="11"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> <span class="hljs-keyword">var</span> worksheet = workbook.<span class="hljs-property">Sheets</span>[sheetNames[<span class="hljs-number">0</span>]];</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="12"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> <span class="hljs-comment">// var excelData = XLSX.utils.sheet_to_json(worksheet); //JSON</span></div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="13"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> <span class="hljs-keyword">let</span> html = <span class="hljs-variable constant_">XLSX</span>.<span class="hljs-property">utils</span>.<span class="hljs-title function_">sheet_to_html</span>(worksheet);</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="14"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> <span class="hljs-variable language_">document</span>.<span class="hljs-title function_">getElementsByClassName</span>(<span class="hljs-string">'xlsxClass'</span>)[<span class="hljs-number">0</span>].<span class="hljs-property">innerHTML</span> = html</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="15"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line">};</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="16"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> </div></div></li></ol></code><div class="hide-preCode-box"><span class="hide-preCode-bt" data-report-view="{"spm":"1001.2101.3001.7365"}"><img class="look-more-preCode contentImg-no-view" src="https://1000bd.com/contentImg/2022/06/27/191644837.png" alt="" title=""></span></div><div class="hljs-button signin active" data-title="登录复制" data-report-click="{"spm":"1001.2101.3001.4334"}" onclick="hljs.signin(event)"></div></pre> <p>pdf预览 </p> <pre data-index="5" class="set-code-show" name="code"><code class="language-javascript hljs"><ol class="hljs-ln" style="width:100%"><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="1"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line">下载包 npm install pdfjs-dist</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="2"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line">我使用的是npm install pdfjs-dist@<span class="hljs-number">2.0</span><span class="hljs-number">.943</span>版本，以下例子使用的是vue3+vite创建的项目</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="3"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line">以下例子通过canvas来渲染pdf</div></div></li></ol></code><div class="hljs-button signin active" data-title="登录复制" data-report-click="{"spm":"1001.2101.3001.4334"}" onclick="hljs.signin(event)"></div></pre> <pre data-index="6" class="set-code-show" name="code"><code class="language-javascript hljs"><ol class="hljs-ln" style="width:879px"><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="1"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"><template></div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="2"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> <span class="language-xml"><span class="hljs-tag"><<span class="hljs-name">div</span> <span class="hljs-attr">class</span>=<span class="hljs-string">"box"</span>></span></span></div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="3"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> <span class="hljs-tag"><<span class="hljs-name">div</span> <span class="hljs-attr">class</span>=<span class="hljs-string">"tool-bar"</span>></span></div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="4"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> <span class="hljs-tag"><<span class="hljs-name">div</span>></span>{{ pdfParams.pageNumber }} / {{ pdfParams.total }}<span class="hljs-tag"></<span class="hljs-name">div</span>></span></div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="5"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> <span class="hljs-tag"><<span class="hljs-name">button</span> <span class="hljs-attr">type</span>=<span class="hljs-string">"primary"</span> <span class="hljs-attr">:disabled</span>=<span class="hljs-string">"pdfParams.pageNumber == pdfParams.total"</span> @<span class="hljs-attr">click</span>=<span class="hljs-string">"nextPage"</span>></span>下一页</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="6"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> <span class="hljs-tag"></<span class="hljs-name">button</span>></span></div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="7"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> <span class="hljs-tag"><<span class="hljs-name">button</span> <span class="hljs-attr">type</span>=<span class="hljs-string">"primary"</span> <span class="hljs-attr">:disabled</span>=<span class="hljs-string">"pdfParams.pageNumber == 1"</span> @<span class="hljs-attr">click</span>=<span class="hljs-string">"prevPage"</span>></span>上一页<span class="hljs-tag"></<span class="hljs-name">button</span>></span></div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="8"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> <span class="hljs-tag"></<span class="hljs-name">div</span>></span></div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="9"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> <span class="hljs-tag"><<span class="hljs-name">canvas</span> <span class="hljs-attr">id</span>=<span class="hljs-string">"pdf-render"</span>></span><span class="hljs-tag"></<span class="hljs-name">canvas</span>></span></div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="10"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> <span class="hljs-tag"></<span class="hljs-name">div</span>></span></div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="11"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"></template></div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="12"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> </div></div></li></ol></code><div class="hljs-button signin active" data-title="登录复制" data-report-click="{"spm":"1001.2101.3001.4334"}" onclick="hljs.signin(event)"></div></pre> <pre data-index="7" class="set-code-hide" name="code"><code class="language-javascript hljs"><ol class="hljs-ln" style="width:100%"><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="1"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"><script setup></div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="2"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"><span class="hljs-keyword">import</span> { onMounted, ref, reactive } <span class="hljs-keyword">from</span> <span class="hljs-string">'vue'</span></div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="3"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"><span class="hljs-keyword">const</span> pdfParams = <span class="hljs-title function_">reactive</span>({</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="4"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> <span class="hljs-attr">pageNumber</span>: <span class="hljs-number">1</span>, <span class="hljs-comment">// 当前页</span></div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="5"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> <span class="hljs-attr">total</span>: <span class="hljs-number">0</span>, <span class="hljs-comment">// 总页数</span></div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="6"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line">});</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="7"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> </div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="8"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"><span class="hljs-comment">// 不要定义为ref或reactive格式，就定义为普通的变量</span></div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="9"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"><span class="hljs-keyword">let</span> pdfDoc = <span class="hljs-literal">null</span>;</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="10"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"><span class="hljs-comment">// 这里必须使用异步去引用pdf文件，直接去import会报错，也不知道为什么</span></div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="11"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"><span class="hljs-title function_">onMounted</span>(<span class="hljs-keyword">async</span> ()=> {</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="12"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> <span class="hljs-keyword">let</span> pdfjs = <span class="hljs-keyword">await</span> <span class="hljs-keyword">import</span>(<span class="hljs-string">'pdfjs-dist/build/pdf'</span>)</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="13"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> <span class="hljs-keyword">let</span> pdfjsWorker = <span class="hljs-keyword">await</span> <span class="hljs-keyword">import</span>(<span class="hljs-string">'pdfjs-dist/build/pdf.worker.entry'</span>)</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="14"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> pdfjs.<span class="hljs-property">GlobalWorkerOptions</span>.<span class="hljs-property">workerSrc</span> = pdfjsWorker</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="15"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> <span class="hljs-comment">// 此文件位于public/test2.pdf</span></div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="16"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> <span class="hljs-keyword">let</span> url = <span class="hljs-title function_">ref</span>(<span class="hljs-string">'/test2.pdf'</span>)</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="17"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> pdfjs.<span class="hljs-title function_">getDocument</span>(url.<span class="hljs-property">value</span>).<span class="hljs-property">promise</span>.<span class="hljs-title function_">then</span>(<span class="hljs-function"><span class="hljs-params">doc</span> =></span> {</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="18"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> pdfDoc = doc</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="19"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> pdfParams.<span class="hljs-property">total</span> = doc.<span class="hljs-property">numPages</span></div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="20"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> <span class="hljs-title function_">getPdfPage</span>(<span class="hljs-number">1</span>)</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="21"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> })</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="22"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line">})</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="23"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> </div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="24"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"><span class="hljs-comment">// 加载pdf的某一页</span></div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="25"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"><span class="hljs-keyword">const</span> <span class="hljs-title function_">getPdfPage</span> = (<span class="hljs-params">number</span>) => {</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="26"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> pdfDoc.<span class="hljs-title function_">getPage</span>(number).<span class="hljs-title function_">then</span>(<span class="hljs-function"><span class="hljs-params">page</span> =></span> {</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="27"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> <span class="hljs-keyword">const</span> viewport = page.<span class="hljs-title function_">getViewport</span>()</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="28"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> <span class="hljs-keyword">const</span> canvas = <span class="hljs-variable language_">document</span>.<span class="hljs-title function_">getElementById</span>(<span class="hljs-string">'pdf-render'</span>)</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="29"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> <span class="hljs-keyword">const</span> context = canvas.<span class="hljs-title function_">getContext</span>(<span class="hljs-string">'2d'</span>)</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="30"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> canvas.<span class="hljs-property">width</span> = viewport.<span class="hljs-property">viewBox</span>[<span class="hljs-number">2</span>]</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="31"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> canvas.<span class="hljs-property">height</span> = viewport.<span class="hljs-property">viewBox</span>[<span class="hljs-number">3</span>]</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="32"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> viewport.<span class="hljs-property">width</span> = viewport.<span class="hljs-property">viewBox</span>[<span class="hljs-number">2</span>]</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="33"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> viewport.<span class="hljs-property">height</span> = viewport.<span class="hljs-property">viewBox</span>[<span class="hljs-number">3</span>]</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="34"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> canvas.<span class="hljs-property">style</span>.<span class="hljs-property">width</span> = <span class="hljs-title class_">Math</span>.<span class="hljs-title function_">floor</span>(viewport.<span class="hljs-property">width</span>) + <span class="hljs-string">'px'</span></div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="35"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> canvas.<span class="hljs-property">style</span>.<span class="hljs-property">height</span> = <span class="hljs-title class_">Math</span>.<span class="hljs-title function_">floor</span>(viewport.<span class="hljs-property">height</span>) + <span class="hljs-string">'px'</span></div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="36"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> </div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="37"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> <span class="hljs-keyword">let</span> renderContext = {</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="38"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> <span class="hljs-attr">canvasContext</span>: context,</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="39"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> <span class="hljs-attr">viewport</span>: viewport,</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="40"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> <span class="hljs-comment">// 这里transform的六个参数，使用的是transform中的Matrix(矩阵)</span></div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="41"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> <span class="hljs-attr">transform</span>: [<span class="hljs-number">1</span>, <span class="hljs-number">0</span>, <span class="hljs-number">0</span>, -<span class="hljs-number">1</span>, <span class="hljs-number">0</span>, viewport.<span class="hljs-property">height</span>]</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="42"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> }</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="43"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> <span class="hljs-comment">// 进行渲染</span></div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="44"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> page.<span class="hljs-title function_">render</span>(renderContext)</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="45"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> })</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="46"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line">}</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="47"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"><span class="hljs-comment">// 下一页功能</span></div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="48"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"><span class="hljs-keyword">const</span> <span class="hljs-title function_">prevPage</span> = (<span class="hljs-params"></span>) => {</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="49"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> <span class="hljs-keyword">if</span>(pdfParams.<span class="hljs-property">pageNumber</span> > <span class="hljs-number">1</span>) {</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="50"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> pdfParams.<span class="hljs-property">pageNumber</span> -= <span class="hljs-number">1</span></div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="51"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> } <span class="hljs-keyword">else</span> {</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="52"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> pdfParams.<span class="hljs-property">pageNumber</span> = <span class="hljs-number">1</span></div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="53"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> }</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="54"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> <span class="hljs-title function_">getPdfPage</span>(pdfParams.<span class="hljs-property">pageNumber</span>)</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="55"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line">}</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="56"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"><span class="hljs-comment">// 上一页功能</span></div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="57"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"><span class="hljs-keyword">const</span> <span class="hljs-title function_">nextPage</span> = (<span class="hljs-params"></span>) => {</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="58"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> <span class="hljs-keyword">if</span>(pdfParams.<span class="hljs-property">pageNumber</span> < pdfParams.<span class="hljs-property">total</span>) {</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="59"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> pdfParams.<span class="hljs-property">pageNumber</span> += <span class="hljs-number">1</span></div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="60"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> } <span class="hljs-keyword">else</span> {</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="61"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> pdfParams.<span class="hljs-property">pageNumber</span> = pdfParams.<span class="hljs-property">total</span></div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="62"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> }</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="63"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> <span class="hljs-title function_">getPdfPage</span>(pdfParams.<span class="hljs-property">pageNumber</span>)</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="64"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line">}</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="65"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"></script></div></div></li></ol></code><div class="hide-preCode-box"><span class="hide-preCode-bt" data-report-view="{"spm":"1001.2101.3001.7365"}"><img class="look-more-preCode contentImg-no-view" src="https://1000bd.com/contentImg/2022/06/27/191644837.png" alt="" title=""></span></div><div class="hljs-button signin active" data-title="登录复制" data-report-click="{"spm":"1001.2101.3001.4334"}" onclick="hljs.signin(event)"></div></pre> <p> </p> <p>以上代码看不懂的地方可以查阅官方代码，大部分都是固定的写法。</p> <p></p> <p><img alt="" height="615" src="https://1000bd.com/contentImg/2024/03/15/082349107.png" ><strong>以上注意点:</strong></p> <ul><li>必须异步引用pdf的文件！！！</li><li>pdf演示文件位于public/test2.pdf</li><li>transform: [1, 0, 0, -1, 0, viewport.height],使用了transform中的Matrix(矩阵)</li><li>下一页和上一页功能都需要重新渲染</li></ul> <p></p> <p> </p> <p> </p> <p> </p> <p> </p> </div> </div> </li> <li class="list-group-item ul-li"> <b>相关阅读:</b><br> <nobr> <a href="/Article/Index/1355971">小程序和前台开发软件定制的相关信息|APP网站搭建</a> <br /> <a href="/Article/Index/1479953">sso 四种授权模式</a> <br /> <a href="/Article/Index/1388988">竞赛 深度学习交通车辆流量分析 - 目标检测与跟踪 - python opencv</a> <br /> <a href="/Article/Index/1073839">ISO9001质量管理体系剖析</a> <br /> <a href="/Article/Index/1193139">ZMQ之克隆模式的可靠性</a> <br /> <a href="/Article/Index/1169060">【LeetCode 1758】生成交替二进制字符串的最少操作数</a> <br /> <a href="/Article/Index/835447">【Qt炫酷动画】1.easing官方demo详细剖析</a> <br /> <a href="/Article/Index/1455416">Code Former安装及使用</a> <br /> <a href="/Article/Index/1340710">【C语言】内存函数的详细教学和模拟实现</a> <br /> <a href="/Article/Index/811594">【leetcode】【剑指offer】【二进制中1的个数】</a> <br /> </nobr> </li> <li class="list-group-item from-a mb-2"> 原文地址：https://blog.csdn.net/weixin_57031986/article/details/136698608 </li> </ul> </div> <div class="col-lg-4 col-sm-12"> <ul class="list-group" style="word-break:break-all;"> <li class="list-group-item ul-li-bg" aria-current="true"> 最新文章 </li> <li class="list-group-item ul-li"> <nobr> <a href="/Article/Index/1484446">攻防演习之三天拿下官网站群</a> <br /> <a href="/Article/Index/1515268">数据安全治理学习——前期安全规划和安全管理体系建设</a> <br /> <a href="/Article/Index/1759065">企业安全 | 企业内一次钓鱼演练准备过程</a> <br /> <a href="/Article/Index/1485036">内网渗透测试 | Kerberos协议及其部分攻击手法</a> <br /> <a href="/Article/Index/1877332">0day的产生 | 不懂代码的"代码审计"</a> <br /> <a href="/Article/Index/1887576">安装scrcpy-client模块av模块异常，环境问题解决方案</a> <br /> <a href="/Article/Index/1887578">leetcode hot100【LeetCode 279. 完全平方数】java实现</a> <br /> <a href="/Article/Index/1887512">OpenWrt下安装Mosquitto</a> <br /> <a href="/Article/Index/1887520">AnatoMask论文汇总</a> <br /> <a href="/Article/Index/1887496">【AI日记】24.11.01 LangChain、openai api和github copilot</a> <br /> </nobr> </li> </ul> <ul class="list-group pt-2" style="word-break:break-all;"> <li class="list-group-item ul-li-bg" aria-current="true"> 热门文章 </li> <li class="list-group-item ul-li"> <nobr> <a href="/Article/Index/888177">十款代码表白小特效 一个比一个浪漫 赶紧收藏起来吧！！！</a> <br /> <a href="/Article/Index/797680">奉劝各位学弟学妹们，该打造你的技术影响力了！</a> <br /> <a href="/Article/Index/888183">五年了，我在 CSDN 的两个一百万。</a> <br /> <a href="/Article/Index/888179">Java俄罗斯方块，老程序员花了一个周末，连接中学年代！</a> <br /> <a href="/Article/Index/797730">面试官都震惊，你这网络基础可以啊！</a> <br /> <a href="/Article/Index/797725">你真的会用百度吗？我不信 — 那些不为人知的搜索引擎语法</a> <br /> <a href="/Article/Index/797702">心情不好的时候，用 Python 画棵樱花树送给自己吧</a> <br /> <a href="/Article/Index/797709">通宵一晚做出来的一款类似CS的第一人称射击游戏Demo！原来做游戏也不是很难，连憨憨学妹都学会了！</a> <br /> <a href="/Article/Index/797716">13 万字 C 语言从入门到精通保姆级教程2021 年版</a> <br /> <a href="/Article/Index/888192">10行代码集2000张美女图，Python爬虫120例，再上征途</a> <br /> </nobr> </li> </ul> </div> </div> </div> <!-- 主体 --> <!--body结束--> <!--这里是footer模板--> <!--footer--> <nav class="navbar navbar-inverse navbar-fixed-bottom"> <div class="container"> <div class="row"> <div class="col-md-12"> <div class="text-muted center foot-height"> Copyright © 2022 侵权请联系<a href="mailto:2656653265@qq.com">2656653265@qq.com</a> <a href="https://beian.miit.gov.cn/" target="_blank">京ICP备2022015340号-1</a> </div> <div style="width:300px;margin:0 auto; padding:0px 5px;"> <a href="/regex.html">正则表达式工具</a> <a href="/cron.html">cron表达式工具</a> <a href="/pwdcreator.html">密码生成工具</a> </div> <div style="width:300px;margin:0 auto; padding:5px 0;"> <a target="_blank" href="http://www.beian.gov.cn/portal/registerSystemInfo?recordcode=11010502049817" style="display:inline-block;text-decoration:none;height:20px;line-height:20px;"> <img src="" style="float:left;" /><p style="float:left;height:20px;line-height:20px;margin: 0px 0px 0px 5px; color:#939393;">京公网安备 11010502049817号</p></a> </div> </div> </div> </div> </nav> <!--footer--> <!--footer模板结束--> <script src="/js/plugins/jquery/jquery.js"></script> <script src="/js/bootstrap.min.js"></script> <!--这里是scripts模板--> <!--scripts模板结束--> </body> </html>