使用JavaScript 对同一个按钮点击打开，点击关闭 // using a button to close or open a div 

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8" />
    <title>test</title>
    <style>
        body{ 
            padding: 0;
            margin: 0; }
        #box{ 
            width: 200px;
            height: 0;
            background: #00f;
            overflow: hidden; }
    </style>
    <script>
    window.onload = function(){
        var box = document.getElementById('box');
        var btn = document.getElementById('btn');
        btn.onclick = function(){
            var height = box.offsetHeight;
            if(height == 0){
                box.style.height = 100+'px';
            }else{ 
                box.style.height = 0; }
        }
    }
    </script>
</head>
<body>
    <div id="box">
        <h2>Hello World</h2>
    </div>
    <button id="btn">点击展开关闭</button>
</body>
</html>

 

posted @ 2016-11-12 16:03  巫瞅瞅  阅读(486)  评论(0)    收藏  举报