<html>
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<head>
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<title>Promise</title>
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<script type='text/javascript'>
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var ok = true;
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function successCallBack(){
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console.log("成功");
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};
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function failureCallBack(){
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console.log("失败");
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};
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function successCallBack1(){
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console.log("成功1");
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};
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function failureCallBack1(){
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console.log("失败1");
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};
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const wait = ()=> new Promise((resolve,reject)=> {
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setTimeout(() => {
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console.log('setTimeout1执行完毕');
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resolve();
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}, 0);
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});
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//调用报错，wait2返回的是setTimeout方法。
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const wait1 = ()=> setTimeout(() => {
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console.log('setTimeout2执行完毕');
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return new Promise((resolve,reject)=> {
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resolve();
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});
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}, 0);
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var use = wait().then(successCallBack,failureCallBack).then(successCallBack1,failureCallBack1);
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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>
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