code: function addUrlChangeListener(url){
          if (browser.ie) {
              url.onpropertychange = function () {
                  createPreviewVideo( this.value );
              }
          } else {
              url.addEventListener( "input", function () {
                  createPreviewVideo( this.value );
              }, false );
          }
      }
docs: 监听url改变事件
  @param url