JavaScript复习第二天js小特效练习

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注意，驼峰命名法，parseInt转换整数，类对象集合等细节。

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"><html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en"><head>    <meta http-equiv="Content-Type" content="text/html;charset=UTF-8">    <title>Document</title>    <script type="text/javascript">        var demo = document.getElementsByClassName('demo');        function clickDemo(){            if(demo[0].style.background.indexOf('red') >=0){                demo[0].style.background="green";            }else{                demo[0].style.background="red";            }            console.log(demo[0].style.width);//控制台显示width字符串            console.log(demo[0].style.height);//控制台显示height字符串            console.log(demo[0].style.borderBottomWidth);//控制台显示borderBottom字符串                                 demo[0].style.width = parseInt(demo[0].style.width)+5+'px';            demo[0].style.height = parseInt(demo[0].style.height)+5+'px';            demo[0].style.borderBottomWidth = parseInt(demo[0].style.borderBottomWidth)+5+'px';                             }    </script>    <style type="text/css">    </style></head><body>    <!-- 点击div 背景红绿交替，宽高增加5px，下边框增加1px -->    <div class="demo" onclick = "clickDemo();" style ="width:300px;height:300px;background:red;border-bottom:1px solid purple;"></div></body></html>

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