Code:

<img id="myImg" src="https://www.jyshare.com/wp-content/uploads/2017/01/btotbhpudiagtmvlkyrs.jpg" alt="文本描述信息" width="300" height="200">

<div id="myModal" class="modal">

<span class="close" onclick="document.getElementById('myModal').style.display='none'">&times;</span>

<img class="modal-content" id="img01">

<div id="caption"></div>
</div>
<style>
    /* 触发弹窗图片的样式 */
    #myImg {
        border-radius: 5px;
        cursor: pointer;
        transition: 0.3s;
    }
     
    #myImg:hover {opacity: 0.7;}
     
    /* 弹窗背景 */
    .modal {
        display: none; /* Hidden by default */
        position: fixed; /* Stay in place */
        z-index: 1; /* Sit on top */
        padding-top: 100px; /* Location of the box */
        left: 0;
        top: 0;
        width: 100%; /* Full width */
        height: 100%; /* Full height */
        overflow: auto; /* Enable scroll if needed */
        background-color: rgb(0,0,0); /* Fallback color */
        background-color: rgba(0,0,0,0.9); /* Black w/ opacity */
    }
     
    /* 图片 */
    .modal-content {
        margin: auto;
        display: block;
        width: 80%;
        max-width: 700px;
    }
     
    /* 文本内容 */
    #caption {
        margin: auto;
        display: block;
        width: 80%;
        max-width: 700px;
        text-align: center;
        color: #ccc;
        padding: 10px 0;
        height: 150px;
    }
     
    /* 添加动画 */
    .modal-content, #caption { 
        -webkit-animation-name: zoom;
        -webkit-animation-duration: 0.6s;
        animation-name: zoom;
        animation-duration: 0.6s;
    }
     
    @-webkit-keyframes zoom {
        from {-webkit-transform:scale(0)} 
        to {-webkit-transform:scale(1)}
    }
     
    @keyframes zoom {
        from {transform:scale(0)} 
        to {transform:scale(1)}
    }
     
    /* 关闭按钮 */
    .close {
        position: absolute;
        top: 15px;
        right: 35px;
        color: #f1f1f1;
        font-size: 40px;
        font-weight: bold;
        transition: 0.3s;
    }
     
    .close:hover,
    .close:focus {
        color: #bbb;
        text-decoration: none;
        cursor: pointer;
    }
     
    /* 小屏幕中图片宽度为 100% */
    @media only screen and (max-width: 700px){
        .modal-content {
            width: 100%;
        }
    }
</style>

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