自定义滚动条，兼容IE和其他浏览器

parent node must be set width(or height)

custom scrollBar.

var bodyScrollBar = new ScrollBar(document.body,{ // barY : true, // barX : true, // onscroll : function(scrollTop,scrollLeft){ // do something... // } });

new ScrollBar(document.getElementById("box"));

window.onresize = function(){ bodyScrollBar.resize(); };