js改变style样式和css样式的简单实例
js可实现用户对页面中的选择条件改变页面中的样式，页面样式可以通过style修饰，也可以通过css修饰，先来看一下js改变style样式，代码如下：
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>Change.html</title>
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
<!--<link rel="stylesheet" type="text/css" href="./styles.css">-->
<script language="javascript">
function test4(event) {
if(event.value == "黑色") {
//获取div1
var div1 = document.getElementById('div1');
div1.style.backgroundColor="black";
}
if(event.value == "红色") {
//获取div1
var div1 = document.getElementById('div1');
div1.style.backgroundColor="red";
}
}
</script>
</head>
<body>
<div id="div1" style="width:400px; height:300px; background-color:red;">div1</div>
<input type="button" value="黑色" onclick="test4(this)"/>
<input type="button" value="红色" onclick="test4(this)"/>
</body>
</html>test4(this)代表当前的<input相当于把它看成一个对象。
再来看一下改变css样式，代码如下：
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>Change1.html</title>
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
<link rel="stylesheet" type="text/css" href="css/Change.css">
<script language="javascript">
function test4(event) {
//获取样式表中所有class选择器都获得
var ocssRules = document.styleSheets[0].rules;
//从ocssRules中取出你希望的class
var style1 = ocssRules[0];
if(event.value == "黑色") {
//window.alert(style1.style.backgroundColor);
style1.style.backgroundColor="black";
}else if(event.value == "红色") {
style1.style.backgroundColor="red";
}
}
</script>
</head>
<body>
<div id="div1" class="style1">div1</div>
<input type="button" value="黑色" onclick="test4(this)"/>
<input type="button" value="红色" onclick="test4(this)"/>
</body>
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