<!DOCTYPE html><html lang="en"><head><meta charset="UTF-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta http-equiv="X-UA-Compatible" content="ie=edge"><title>测试</title></head><body><!-- <script>function sleep(millisecond) {return new Promise(resolve => {setTimeout(() => resolve, millisecond)})}/*** 以下是测试代码*/async function test() {console.log('start')await sleep(1000) // 睡眠1秒console.log('end')return 'done';}test().then(val=>{console.log(val);}) // 执行测试函数</script> --><script>function sleep(second) {return new Promise(resolve => {setTimeout(() => {console.log(Math.random());resolve();}, second);});}async function chuanXingDemo() {await sleep(1000);await sleep(1000);await sleep(1000);}async function bingXingDemo() {var tasks = [];for (let i = 0; i < 3; ++i) {tasks.push(sleep(1000));}await Promise.all(tasks);}chuanXingDemo()bingXingDemo()</script></body></html>
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