(转)一个使用方便的用于跳转后保持滚动条位置的JS

/*
 * 这个脚本用于保持页面跳转前后滚动条的位置一致
 * bnc.badboy
 * 2009-8-24
 */

function ScrollHolder()
{
    //add event to window
    this.addWindowListener = function(sEventType, fnHandler) {
        if (window.addEventListener) {
            window.addEventListener(sEventType, fnHandler, false);
        } else if (window.attachEvent) {
            window.attachEvent("on" + sEventType, fnHandler);
        } else {
            window["on" + sEventType] = fnHandler;
        }
    }
    
    //remember scrolling information when window is unloading
    this.whenUnload = function()
    {
        var scrollTop = document.documentElement.scrollTop;
        document.cookie = "scrollTop="+scrollTop;
    }
    
    //set current scroll bar the last page scroll bar position
    this.whenLoad = function()
    {
        var scrollTop = document.cookie.match(new RegExp("(^| )scrollTop=([^;]*)(;|$)"));
        if(scrollTop==null)
            scrollTop = 0;
        window.scrollTo(0,scrollTop[2]);
    }
    
    //run this script
    this.run = function()
    {
        this.addWindowListener("unload", this.whenUnload);
        this.addWindowListener("load", this.whenLoad);
    }
}

var scrollHolder = new ScrollHolder();
scrollHolder.run();

http://nakupanda.javaeye.com/blog/456908