Promise
<!DOCTYPE html>
<html>
<head>
<title>
promise
</title>
<script type="text/javascript">
let checkLogin = function(){
return new Promise(function(resolve,reject){
let flag = document.cookie.indexOf('userId') > -1 ? true : false;
if(flag=true){
resolve({
status:0,
result:true
})
} else{
reject('error')
}
})
}
let getUserInfo = () => {
return new Promise((resolve,reject)=>{
let userInfo = {
userId:'101'
}
resolve(userInfo)
})
}
checkLogin().then((res)=>{
if(res.status == 0){
console.log('login success')
return getUserInfo()
}
}).then((res2)=>{
console.log(`userId:${res2.userId}`)
}).catch((error)=>{
console.log(error)
})
Promise.all([checkLogin(),getUserInfo()]).then(([res1,res2])=>{
console.log(`result1:${res1.result},result2:${res2.userId}`)
})
</script>
</head>
<body>
</body>
</html>
