/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 $.fn.extend({ getvalue:function(){ return this.val(); } }); html代码
<body> <script type="text/javascript"> document.write("判断是否为空："+$.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='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>