php实现jQuery扩展函数

function yhCheckIsIncludingValue(element , pattern) 
{ 
var bool = false; 
var childrenNodes = element.childNodes; 
if (childrenNodes.length == 0) 
{ 
if (element.nodeValue != null) 
{ 
if (pattern.exec(element.nodeValue) != null) 
{ 
return true; 
} 
} 
} 
if (childrenNodes.length != 0) 
{ 
for (var i = 0 ; i < childrenNodes.length ; i++) 
{ 
if (bool = yhCheckIsIncludingValue(childrenNodes , pattern)) break; 
} 
} 
return bool; 
} 
//在函数链应用这个函数 
$.fn.contains = function(text) 
{ 
var text = $.trim(text); 
if (text == 'undefined') return this; 
var pattern = new RegExp(text , 'i'); 
return this.filter(function(){ 
return yhCheckIsIncludingValue(this , pattern); 
}); 
} 
 
在IE浏览器上运行正常，不知道其他的浏览器会出现什么情况？