<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
</head>
<body>
</body>
<script>
// 异步结果返回
function takelongtime(n) {
return new Promise(resolve => {
setTimeout(() => {
resolve(n + 2000)
}, n);
})
}
// 异步请求一
function step1(n) {
return takelongtime(n)
}
// 异步请求二
function step2(n) {
return takelongtime(n)
}
// 异步请求三
function step3(n) {
return takelongtime(n)
}
// 方式一
function mode1(timer) {
Promise.all([step1(2000), step2(4000), step3(6000)]).then(res => {
console.log(res);
clearInterval(timer);
});
}
// 方式二
async function mode2(timer) {
let data_all = await Promise.all([step1(2000), step2(4000), step3(6000)]);
console.log(data_all);
clearInterval(timer);
}
// 方式三
async function mode3(timer) {
let step1_res = await step1(2000);
let step2_res = await step2(4000);
let step3_res = await step3(6000);
console.log(step1_res, step2_res, step3_res);
clearInterval(timer);
}
// 初始化
function init() {
var time = 0
var timer = setInterval(() => {
console.log(time += 1);
}, 1000);
mode1(timer);
// mode2(timer);
// mode3(timer);
}
init();
</script>
</html>
