78 lines
2.2 KiB
HTML
78 lines
2.2 KiB
HTML
<!DOCTYPE html>
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<html lang="en">
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<head>
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<meta charset="UTF-8">
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<meta http-equiv="X-UA-Compatible" content="IE=edge">
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<meta name="viewport" content="width=device-width, initial-scale=1.0">
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<title>Document</title>
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<script>
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// const fs = require('fs');
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// const readFile = function (fileName) {
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// return new Promise(function (resolve, reject) {
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// fs.readFile(fileName, function (error, data) {
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// if (error) return reject(error);
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// resolve(data);
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// });
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// });
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// };
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// const gen = function* () {
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// const f1 = yield readFile('/etc/fstab');
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// const f2 = yield readFile('/etc/shells');
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// console.log(f1.toString());
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// console.log(f2.toString());
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// };
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// // *是 Generator 的声明
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// const gen2 = async function () {
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// const f1 = await readFile("file1")
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// const f2 = await readFile("file2")
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// console.log(f1.toString())
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// console.log(f2.toString())
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// }
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// // async 声明这个函数是 异步函数 只有在被async修饰的函数中，才能使用await 关键字
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// // await 等待后面的操作完成后才继续执行
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// async function getStockPriceByName(name) {
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// const symbol = await getStockSymbol(name);
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// const stockPrice = await getStockPrice(symbol);
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// return stockPrice;
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// }
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// getStockPriceByName('goog').then(function (result) {
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// console.log(result);
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// });
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async function testAsync() {
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return "hello async";
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}
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async function t1(){
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var data = testAsync();
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console.log(data)
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}
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async function t2(){
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var data = await testAsync();
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console.log(data)
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}
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t1() //没加await修饰的时候 返回的是promise对象
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t2() // 加了await的时候 返回的是promise对象中的value的值 即 hello async!
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// var list =await getlist("url");
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// var uinfo =await getinfo("url");
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// 。。。
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</script>
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</head>
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<body>
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</body>
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</html> |