利用时间控制让表单渐入或者渐出的效果-fade in/out form

一款jquery 在线答题实例，一屏一题，带上一页下一下 答完可以查看成绩，答题带淡出效果！-A jQuery online answer instance, a screen, a question, take a look at the answer to the question, the answer is to fade effect!