ElasticProgress可以创建一个有弹力效果的进度条。示例代码：var progress=new ElasticProgress('.Upload', {  // ...  onClick:function(){    progress.open();  }});function theFunctionYouAreUsingToCheckProgress(){  // ...  progress.setValue(value);}// with jQuery$(".Upload").ElasticProgress({  // ...  onClick:function(){    $(this)