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js性能-对象查找值与迭代查找值性能对比
前言
公司的一次cr，了解到对象查找值比迭代查找值效率高，因此整了个数据对比的界面
结果
说明：- Object：代表对象查找值
- Iteration:表示迭代查找值
源码
DOCTYPE html> <html> <head> <meta charset="utf-8" /> <title>对象和循环对比title> <script src="https://gw.alipayobjects.com/os/antv/pkg/_antv.data-set-0.10.1/dist/data-set.min.js">script> <script src="https://gw.alipayobjects.com/os/lib/antv/g2/3.4.10/dist/g2.min.js">script> head> <style> .c-wrap { display: flex; flex-direction: row; } .code-wrap { } style> <body> <div>数据量（x）与消耗时间(y)对比div> <div class="c-wrap"> <div id="mountNode">div> <div class="code-wrap"> <div> <pre> <code> function funM1(apiDataList, localDataList) { // const start = new Date().getTime(); const start = window.performance.now(); // 构造成对象 const apiDataObj = apiDataList.reduce((pre, cur) => { if (!(cur.id in pre)) { pre[cur.id] = cur.price; } return pre; }, {}); const newList1 = localDataList.map((item) => { const apiDataObjItem = apiDataObj[item.id]; if (apiDataObjItem) { item.price = apiDataObjItem.price; } return item; }); // const end = new Date().getTime(); const end = window.performance.now(); const duration = end - start; return duration; } code>pre> div> <div> <pre> <code> function funM2(apiDataList, localDataList) { // const start = new Date().getTime(); const start = window.performance.now(); const newList2 = localDataList.map((item) => { const tmpItem = apiDataList.find((itemIn) => itemIn.id === item.id); if (tmpItem) { item.price = tmpItem.price; } return item; }); // const end = new Date().getTime(); const end = window.performance.now(); const duration = end - start; return duration; } code>pre> div> div> div> <script> /** * tips1: * genNumsLevels(level, step) * 可变更level 查看更多级别数据的运行情况 * * * tips2: * 计时方法： window.performance.now(); 或者 new Date().getTime() **/ // 数据准备 公共数据 let showData = []; const numsLevels = genNumsLevels(10, 2000); numsLevels.map((item) => { const apiDataList = genApiDataList(item); const localDataList = genLocalDataList(item); const timeM1 = funM1(apiDataList, localDataList); const timeM2 = funM2(apiDataList, localDataList); showData.push({ dataLevel: item, Object: timeM1, Iteration: timeM2, }); }); /** * . 算法1:使用对象寻找值 start **/ function funM1(apiDataList, localDataList) { const start = new Date().getTime(); // const start = window.performance.now(); // 构造成对象 const apiDataObj = apiDataList.reduce((pre, cur) => { if (!(cur.id in pre)) { pre[cur.id] = cur.price; } return pre; }, {}); const newList1 = localDataList.map((item) => { const apiDataObjItem = apiDataObj[item.id]; if (apiDataObjItem) { item.price = apiDataObjItem.price; } return item; }); const end = new Date().getTime(); // const end = window.performance.now(); const duration = end - start; return duration; } /** * . 算法1:使用对象寻找值 end **/ /** * . 算法2:使用循环寻找值 start **/ function funM2(apiDataList, localDataList) { const start = new Date().getTime(); // const start = window.performance.now(); const newList2 = localDataList.map((item) => { const tmpItem = apiDataList.find((itemIn) => itemIn.id === item.id); if (tmpItem) { item.price = tmpItem.price; } return item; }); const end = new Date().getTime(); // const end = window.performance.now(); const duration = end - start; return duration; } /** * . 算法2:使用循环寻找值 end **/ // 构造数据量级 function genNumsLevels(level, step) { const list = []; for (let i = 1; i <= level; i++) { list.push(2000 * i - step); } return list; } // 生成接口来的数据 function genApiDataList(numsLevel) { const tmpList = []; for (let i = 0; i < numsLevel; i++) { tmpList.push({ id: i + 1, price: i + 1, }); } return tmpList; } // 生成本地已有的数据 function genLocalDataList(numsLevel) { const tmpList = []; for (let i = 0; i < numsLevel; i++) { tmpList.push({ id: i + 1, name: `名称${i + 1}`, price: i + 2.1, }); } return tmpList; } let ds = new DataSet(); let dv = ds.createView().source(showData); // fold 方式完成了行列转换，如果不想使用 DataSet 直接手工转换数据即可 dv.transform({ type: "fold", fields: ["Object", "Iteration"], // 展开字段集 key: "city", // key字段 value: "temperature", // value字段 }); let chart = new G2.Chart({ container: "mountNode", // forceFit: true, width: 800, // 指定图表宽度 height: 500, // 指定图表高度 }); chart.source(dv, { dataLevel: { range: [0, 1], }, }); chart.tooltip({ crosshairs: { type: "line", }, }); chart.axis("temperature", { label: { formatter: function formatter(val) { return val + "ms"; }, }, }); chart .line() .position("dataLevel*temperature") .color("city") .shape("smooth"); chart .point() .position("dataLevel*temperature") .color("city") .size(4) .shape("circle") .style({ stroke: "#fff", lineWidth: 1, }); chart.render(); script> body> html>- 1
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结尾
源码可以直接跑，图用的antv的cdn。over
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- 原文地址：https://blog.csdn.net/qq_40020447/article/details/126381778
