top在html5里什么意思,html中的scrolltop是什么意思

scrolltop是jQuery中的一个方法，它可以设置

元素中滚动条的垂直偏移量，基本的用法是：

scrollTop() 方法返或设置匹配元素的滚动条的垂直位置。

scroll top offset 指的是滚动条相对于其顶部的偏移。

如果该方法未设置参数，则返以像素计的相对滚动条顶部的偏移。

工具原料：jQuery、编辑器、浏览器

1、在一个有内容的div中是吸纳设置滚动条的偏移量和获取偏移量的值，代码如下：

$(document).ready(function(){

$(".btn1").click(function(){

$("div").scrollTop(100);

});

$(".btn2").click(function(){

alert($("div").scrollTop()+" px");

});

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