日期:2014-05-17  浏览次数:20657 次

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

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<HTML>   
<HEAD>   
<TITLE>testClassName</TITLE>   
</HEAD>   

<BODY>   
<p>&nbsp;</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>
</HTML> 

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