日期:2014-05-16  浏览次数:20301 次

javascript 向下滚动

Google Reader 阅读器中,当向下拉动到尾部时,它会自动加载下面的部分。

下面的代码主要实现的是向下滚动。

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<html>
<head>
    <meta http-equiv="content-type" content="text/html; charset=utf-8">
    <title>无限滚动</title>
    <style type="text/css" media="screen">
        ul {width:200px; height:100px; overflow-y:auto;}
    </style>
</head>
<body>
    <ul id="x">
        <li>hello</li>
        <li>hello</li>
        <li>hello</li>
        <li>hello</li>
        <li>hello</li>
        <li>hello</li>
        <li>hello</li>
        <li>hello</li>
    </ul>
    <script type="text/javascript" charset="utf-8">
        var i = 0;
        var $ = function (name) {return document.getElementById(name) };
        var a = $('x');
        a.onscroll = function () {
            if ( this.scrollHeight - this.clientHeight - this.scrollTop < 10) {
                console.log (i);
                var li = document.createElement('li');
                li.innerHTML = "hello " + i++;
                this.appendChild (li);
                if (i >= 40) {
                    this.onscroll = null
                       return;
                }

            }
        }
    </script>
</body>
</html>
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