javascript基础--函数

改变或者获取元素的样式

<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <title>css函数</title>
    <style>
        #div1 {
            margin: 10px;
            width: 100px;
            height: 100px;
            background: red;
        }
    </style>
    <script>
        function getStyle(obj, attr) {
            if (obj.currentStyle) {
                return obj.currentStyle[attr];
            } else {
                return getComputedStyle(obj, false)[attr];
            }
        }

        function css(obj, attr, value) {
            if (arguments.length == 2) { //获取
                return getStyle(obj, attr);
            } else if (arguments.length == 3) { //设置
                obj.style[attr] = value;
            }
        }
        window.onload = function() {
            var oBtn = document.getElementById('btn1');
            var oDiv = document.getElementById('div1');
            oBtn.onclick = function() {
                alert(css(oDiv, 'width'));
            }
        }
    </script>
</head>

<body>
    <input id="btn1" type="button" name="" value="样式">
    <div id="div1"></div>
</body>

</html>

 

posted @ 2017-02-27 16:25  Mr_W_Blog  阅读(173)  评论(0)    收藏  举报