~~~ <script> function getData(url){ const promise = new Promise((resolve,reject)=>{ $.ajax({ url, dataType:"jsonp", success:res=>{ resolve(res) }, error:err=>{ reject(err); } }) }) return promise; } getData("https://api.douban.com/v2/book/search?q=javascript&count=1").then(res=>{ let id = res.books[0].id; return getData(`https://douban.uieee.com/v2/book/${id}`) }).then(res=>{ console.log(res); }) </script> ~~~