一个用JS来给 HTML元素增加或删除className的例子
一个用JS来给 HTML元素增加或删除className的例子
<HTML>
<HEAD>
<TITLE>testClassName</TITLE>
</HEAD>
<BODY>
<p> </p>
<div id="testDiv" class="cc eee ee"></div>
<script type="text/javascript">
function BrowserCompatible () {}
BrowserCompatible.hasClassName = function(element, className) {
if (!element) return;
var elementClassName = element.className;
if (elementClassName.length == 0) return false;
//用正则表达式判断多个class之间是否存在真正的class（前后空格的处理）
if (elementClassName == className || elementClassName.match(new RegExp("(^|\\s)" + className + "(\\s|$)"))) return true;
return false;
}
BrowserCompatible.addClassName = function(element, className) {
if (!element) return;
var elementClassName = element.className;
if (elementClassName.length == 0){
element.className = elementClassName;
return;
}
if (elementClassName == className || elementClassName.match(new RegExp("(^|\\s)" + className + "(\\s|$)"))) return;
element.className = elementClassName + " " + className;
}
BrowserCompatible.removeClassName = function(element, className) {
if (!element) return;
var elementClassName = element.className;
if (elementClassName.length == 0) return;
if(elementClassName == className) {
element.className = "";
return;
}
if (elementClassName.match(new RegExp("(^|\\s)" + className + "(\\s|$)")))
element.className = elementClassName.replace((new RegExp("(^|\\s)" + className + "(\\s|$)"))," ");
}
function $(id){
return document.getElementById(id);
}
//alert(BrowserCompatible.hasClassName($("cc"), "cc"));
BrowserCompatible.addClassName($("testDiv"), "rr");
alert($("testDiv").className);
BrowserCompatible.removeClassName($("testDiv"), "ee");
alert($("testDiv").className);
</script>
</BODY>
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