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).load(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]);

    }

});

//滚动条会到顶部

function scrollTop() {

    document.documentElement.scrollTop = 0;

    document.body.scrollTop = 0;

}