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}`) })