网页刷新 页面位置不变(根据滚动条)

1.发现写js函数时最好函数头这样写window.onload = function ()，如果function window.onbeforeunload() IE9不太兼容.兼容IE6，IE7，IE8，IE9

window.onbeforeunload = function () {            var scrollPos;            if (typeof window.pageYOffset != 'undefined') {                scrollPos = window.pageYOffset;            }            else if (typeof document.compatMode != 'undefined' &&            document.compatMode != 'BackCompat') {                scrollPos = document.documentElement.scrollTop;            }            else if (typeof document.body != 'undefined') {                scrollPos = document.body.scrollTop;            }            document.cookie = "scrollTop=" + scrollPos; //存储滚动条位置到cookies中}window.onload = function () {            if (document.cookie.match(/scrollTop=([^;]+)(;|$)/) != null) {                var arr = document.cookie.match(/scrollTop=([^;]+)(;|$)/); //cookies中不为空，则读取滚动条位置                document.documentElement.scrollTop = parseInt(arr[1]);                document.body.scrollTop = parseInt(arr[1]);                        }}