ajax jsonp的跨域请求

时间:2023-02-08 19:46:15

1.页面ajax的请求

$.ajax({
  async:
false,
  url:
'http://localhost:8080/downloadVideos',//跨域的dns/document!searchJSONResult.action,
  type: "GET",
  dataType:
'jsonp',
  jsonp:
'jsoncallback',
  jsonpCallback:
"cb",//自定义返回函数的名称,要与服务端保持一致
  data: {
    id:ID,
    user:user
  },
  timeout:
5000,
  success:
function (json) {
    $(data).css(
"background","red");
    alert(json);
  }
});

2.服务端nodeJS的返回

app.get('/downloadVideos', function (req, res, next) {
  
var random = new Date().getTime();
  
var url = "https://savemedia.com/generate/";
  
var videosID = req.query.id;
  superagent
    .get(url
+ videosID + "?random=" + random)
    .end(
function (err, sres) { // callback
      //
常规的错误处理
      if (err) {
        
return next(err);
      }
      
var obj = JSON.parse(sres.text);
      
var url = obj.download.watch[0].url;
      
var videoName = new Date().getTime();

      downloadFile(url,
"../public/videos/" + videoName + ".mp4", function (err) {
      
if (err) {
        
return next(err);
      // console.log(videoName
+ ".mp4" + '下载完毕');
      });
      
var videoUrl = 'http://**.**.**.**:8080/videos/' + videoName + '.mp4';
      res.send(
"cb(" + JSON.stringify(videoUrl) + ")");
    });
 });

//文件下载
function downloadFile(uri, filename, callback) {
  
var stream = fs.createWriteStream(filename);
  request(uri).pipe(stream).on(
'close', callback);
}