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<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
</head>
<body>
<script>
console.log(typeof Promise);
console.dir(Promise);
var p = new Promise(function(resolve, reject) {
//这里实现一步任务
setTimeout(function() {
var flag = true;
if (flag) {
//正常情况
resolve('hello');
} else {
reject('出错了');
}
}, 100)
});
p.then(function(data) {
console.log(data)
}, function(info) {
console.log(info);
})
</script>
</body>
</html>
