jsonp('xxx.php', { uid: 1 }, function (res) {

      console.log(res)

    })

 jsonp('http://localhost/server.php', { uid: 1 }, function (res) {

      console.log(res)

    })

     function jsonp (url, params, callback) {

       var funcName = 'jsonp' + Date.now() + Math.random().toString().substr(2, 5)

       if (typeof params === 'object') {

         var tempArr = []

         for (var key in params) {

           var value = params[key]

           tempArr.push(key + '=' + value)

         }

         params = tempArr.join('&')

       }

       var script = document.createElement('script')

       script.src = url + '?' + params + '&callback=' + funcName

       document.body.appendChild(script)

       window[funcName] = function (data) {

         callback(data)

         delete window[funcName]

         document.body.removeChild(script)

       }

     }