~~~ //promise function http(path){ return new Promise((resolve,reject)=>{ $.ajax({ url:`https://api.douban.com/v2/movie/${path}`, type:'get', dataType:"jsonp", success:res=>{ resolve(res) }, error:err=>{ reject(err) } }) }) } http('top250').then(data=>{ var id = data.subjects[0].id; return http(id); }).catch(err=>{ console.log(err.status) }).then(data=>{ console.log(data); }) ~~~