JavaScript复习第二天js小特效练习

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>

你可能感兴趣的:(JavaScript,对象)