1-1 promise-ajax

function http() {
    return new Promise((resolve,reject)=>{
        $.ajax({
            url:"http://192.168.4.18:3000/top/playlist/?cat=华语",
            type:"get",
            success:res=>{
                resolve(res)
            },
            error:err=>{
                reject(err)
            }
        })
    })
}
<script>
      http("top/playlist/?cat=华语").then(res=>{
      let id = res.playlists[0].id
      console.log(id)
    })
</script>