2-1 回调地狱

  <script>
      /* 回调地狱   */
      var baseUrl = "https://music.aityp.com/";
      $.ajax({
          url:baseUrl +"top/playlist",
          type:"get",
          data:{
              cat:"华语"
          },
          dataType:"json",
          success:res=>{
              var {playlists}= res;
              var item = playlists[0];
              $.ajax({
                  url:`${baseUrl}playlist/detail?id=${item.id}`,
                  type:"get",
                  success:res=>{
                      let id = res.playlist.trackIds[0].id;
                      $.ajax({
                          url:`${baseUrl}song/url?id=${id}`,
                          success:res=>{
                              console.log(res)
                          }
                      })
                  }
              })
          }
      })
  </script>