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<script>

    // 获取滚动条当前的位置
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            scrollTop = document.documentElement.scrollTop;
        }
        else if (document.body) {
            scrollTop = document.body.scrollTop;
        }
        return scrollTop;
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    // 获取当前可是范围的高度
    function getClientHeight() {
        var clientHeight = 0;
        if (document.body.clientHeight && document.documentElement.clientHeight) {
            clientHeight = Math.min(document.body.clientHeight, document.documentElement.clientHeight);
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        else {
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        return clientHeight;
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    // 获取文档完整的高度
    function getScrollHeight() {
        return Math.max(document.body.scrollHeight, document.documentElement.scrollHeight);
    }

    // 注册页面滚动事件
    window.onscroll = function () {
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            console.log("到达底部");
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</script>