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index.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<meta http-equiv="X-UA-Compatible" content="ie=edge" />
<title>Document</title>
</head>
<body></body>
<script>
var arr = [];
arr.push(function(a) {
return new Promise((res, rej) => {
setTimeout(() => {
res(1);
}, 1000);
});
});
arr.push(function(a) {
return new Promise((res, rej) => {
setTimeout(() => {
console.log(a);
++a;
res(a);
}, 1000);
});
});
arr.push(function(a) {
return new Promise((res, rej) => {
setTimeout(() => {
console.log(a)
++a;
res(a);
}, 1000);
});
});
//
function test(arr) {
arr.reduce(function(a,b,c,d){
return a.then(b);
},arr[0]())
}
test(arr);
</script>
</html>