Promise用法

使用方法

let checkLogin = function(){
    return new Promise((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: "100"
        }
        resolve(userInfo)
    })
}

checkLogin().then((res) => {
    if(res.status == 0){
        console.log('login success)
    }
}).catch((error) => {
    console.log(`error${error}`)
}).then((res2) => {
    console.log(`userId:${res2.userId}`)
})
或者
Promise.all([chenkLogin(),getUserInfo()]).then(([res1,res2]) => {
    console.log(`result1:${res1.result},result2:${res2.userId}`)
})

vue中使用

getLotteryNums:function(){
  let self = this;
  return new Promise((resolve,reject)=>{
    queryGetParams(global.api + "api/nums/user",{"x-access-token":global.token}).then(response => {
      if(response.data.code == 1){
        self.lotteryNums =  response.data.data;
        resolve(self.lotteryNums);
      }
    });
  })
}