promise() 用法
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2022-07-02 22:54:20
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es6 promise() 用法
Promise 是异步操作，用于解决回调函数和事件
模拟promise环境
<!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>
<script>
let status = 1;
//账号登录
let userLogin = (resolve,reject) => {
setTimeout(() => {
if(status = 1){
resolve({data:"登陆成功",msg:"xxxx",token:"afsafsd111"});
}else{
reject("失败");
}
},2000);
};
//登录成功 获取用户信息
let getUserInfo = (resolve,reject) => {
setTimeout(() => {
if(status = 1){
resolve({data:"获取用户信息成功",msg:"adsasfsd",token:"afsafsd222"});
}else{
reject("失败");
}
},1000);
}
//.then回调
new Promise(userLogin).then(res => {
console.log('用户登录成功')
console.log(res)
return new Promise(getUserInfo)
}).then(res => {
console.log("获取用户信息成功");
console.log(res)
})
</script>
</body>
</html>
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