ES6之promise的使用

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();

}

}).catch((error)=>{

console.log(`errrs:${error}`)

}).then((res2)=>{

console.log(`userId:${res2.userId}`)

});

Promise.all([checkLogin(),getUserInfo()]).then(([res1,res2])=>{

console.log(`result1:${res1.result},result2:${res2.userId}`)

})