79 lines
2.1 KiB
JavaScript
79 lines
2.1 KiB
JavaScript
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import profile from './profile.mjs'
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// pkg.
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//
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console.log(profile.firstName, profile.lastName, profile.year)
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// 模拟的一次网络IO
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// executor: (resolve: (value: any) => void, reject: (reason?: any) => void)
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function testResultCallbackFunc(success, failed) {
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var timeOut = Math.random() * 2;
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console.log('set timeout to: ' + timeOut + ' seconds.');
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setTimeout(function () {
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if (timeOut < 1) {
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console.log('call resolve()...');
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success('200 OK');
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} else {
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console.log('call reject()...');
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failed('timeout in ' + timeOut + ' seconds.');
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}
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}, timeOut * 1000);
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}
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// testResultCallbackFunc(data => console.log(data), err => console.log(err))
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// testResultCallbackFunc(data => console.log(data), err => console.log(err))
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// testResultCallbackFunc(data => console.log(data), err => console.log(err))
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// JS 编程范式
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// new Promise(testResultCallbackFunc).then((value) => {
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// console.log(value)
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// }).catch((err) => {
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// console.log(err)
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// }).finally(() => {
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// console.log('finally')
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// })
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// new Promise(testResultCallbackFunc).then((value) => {
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// console.log(value)
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// }).catch((err) => {
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// console.log(err)
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// }).finally(() => {
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// console.log('finally')
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// })
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// new Promise(testResultCallbackFunc).then((value) => {
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// console.log(value)
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// }).catch((err) => {
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// console.log(err)
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// }).finally(() => {
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// console.log('finally')
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// })
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// async + await 控制异步的调用顺序，也就是同步编程
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// A -> B() -> C()
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// set timeout to: 0.9367326782693821 seconds.
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// call resolve()...
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// set timeout to: 0.09577379370967654 seconds.
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// call resolve()...
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// set timeout to: 0.5294275808882718 seconds.
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// call resolve()...
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var bizfn = async () => {
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try {
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var a = new Promise(testResultCallbackFunc)
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await a
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var b = new Promise(testResultCallbackFunc)
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await b
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var c = new Promise(testResultCallbackFunc)
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await c
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} catch(err) {
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console.log(err)
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}
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// a.then(() => {
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// b.then(()=> {
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// c.then(() => {
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// })
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// })
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// })
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}
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bizfn()
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