/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='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>