jQuery继承extend用法详解

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本文实例为大家jQuery继承extend用法，供大家参考，具体内容如下

js代码

//直接基于jQuery的扩展,判断是否为空 
$.isBlank = function(obj){ 
  return(typeof(obj)=='undefined'||obj==''||obj==null); 
 } 
//直接基于jQuery的扩展，去除html标签，保留内容 
 $.htmlContent = function(tag){ 
  var reTag = /<(?:.|\s)*?>/g; 
  return tag.replace(reTag,""); 
 } 
//直接基于jQuery的扩展(方式二) 
$.xy = { 
sayhello:function(){return "hello";}, 
saybaybay:function(){return "baybay";} 
}; 
//jQuery类级别的扩展 
$.extend({ 
add:function(a,b){return a+b;}, 
diff:function(a,b){return a-b} 
}); 
//jQuery对象级别的扩展 
$.fn.extend({ 
 getvalue:function(){ 
 return this.val(); 
  } 
 });

html代码

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%> 
<% 
String path = request.getContextPath(); 
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/"; 
%> 
 
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> 
<html> 
 <head> 
 <base href="<%=basePath%>"> 
  
 <title>My JSP 'index.jsp' starting page</title> 
 <meta http-equiv="pragma" content="no-cache"> 
 <meta http-equiv="cache-control" content="no-cache"> 
 <meta http-equiv="expires" content="0">  
 <meta http-equiv="keywords" content="keyword1,keyword2,keyword3"> 
 <meta http-equiv="description" content="This is my page"> 
 <!-- 
 <link rel="stylesheet" type="text/css" href="styles.css"> 
 --> 
  
 <script type="text/javascript" src="jquery-1.7.js"></script> 
 <script type="text/javascript" src="jquery-1.7.min.js"></script> 
 <script type="text/javascript" src="my.js"></script> 
 <script type="text/javascript"> 
 $(function(){ 
  var br = $("<br/>"); 
  $(".myspan").append(br); 
 }) 
 </script> 
 </head> 
 <body> 
 <script type="text/javascript"> 
  document.write("判断是否为空："+$.isBlank(null)); 
 </script> 
 <span class="myspan"></span> 
 <script type="text/javascript"> 
  document.write("过滤html标签："+$.htmlContent("<html><body><a id='a1'>a标签</a><div style='width:100%'>div标签</div>内容</body></html>")+"<br/>"); 
  document.write("扩展自jQuery类的xy的sayhello方法："+ $.xy.sayhello()+"</br>"); 
  document.write("扩展自jQuery类的xy的sayhello方法："+ $.xy.saybaybay()+"</br>"); 
  document.write("基于jQuery类的add法："+ $.add(3,5)+"</br>"); 
  document.write("基于jQuery类的diff法："+ $.diff(5,3)+"</br>"); 
  document.write("基于自jQuery类对象的扩展getvalue()："+$("<input type='text' value='str' />").getvalue()+"<br/>"); 
 </script> 
 </body> 
</html>

输出