当滚动条滚动到页面底部自动加载增加内容的js代码

<script>

    // 获取滚动条当前的位置
    function getScrollTop() {
        var scrollTop = 0;
        if (document.documentElement && document.documentElement.scrollTop) {
            scrollTop = document.documentElement.scrollTop;
        }
        else if (document.body) {
            scrollTop = document.body.scrollTop;
        }
        return scrollTop;
    }

    // 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);
        }
        else {
            clientHeight = Math.max(document.body.clientHeight, document.documentElement.clientHeight);
        }
        return clientHeight;
    }

    // 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 () {
        if (getScrollTop() + getClientHeight() == getScrollHeight()) {
            console.log("到达底部");
        }
    }
</script>