页面滑动到最下面，执行代码

<!DOCTYPE html>

<html>
<head>
    <meta name="viewport" content="width=device-width" />
    <title>index</title>
    <style>
        .wrapper{
            width: 100%;
            height: 2000px;
            border: 1px red solid;
        }
        #content {
            width: 100%;
            overflow: hidden;
        }
    </style>
</head>
<body>
    <div class="wrapper" id="wrapper">
        <div id="content"></div>
    </div>
    <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; 
    } 
    //获取当前可视范围的高度 
    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); 
    } 
    window.onscroll = function () { 
        if (getScrollTop() + getClientHeight() == getScrollHeight()) { 
        //ajax从这里开始
        console.log("ajax从这里开始");
    }}
</script>
</body>
</html>

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原文地址：https://www.cnblogs.com/theWayToAce/p/7144696.html