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JavaScript Async 异步请求
tryjs_async2
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<!DOCTYPE html> <html> <body> <h2>JavaScript 异步/等待</h2> <p id="demo"></p> <script> async function getFile() { let myPromise = new Promise(function(resolve, reject) { let req = new XMLHttpRequest(); req.open('GET', "/demo/mycar.html"); req.onload = function() { if (req.status == 200) { resolve(req.response); } else { resolve("文件未找到"); } }; req.send(); }); let result = await myPromise; document.getElementById("demo").innerHTML = result; } getFile(); </script> </body> </html>