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$(function() {
//初始测试数据
var init=function(){
$("#con1").add("#con3").data("key","10001");
};
init();
var select="mytest";
var;
//定义一个新选择器
$.expr[ ":" ][ select ] = function( elem ) {
return !!$.data( elem, name );
};
//使用
$("div:mytest").each(function(){
alert(this.id);//结果:con1 con3
})
});
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jquery中 $.expr使用实例介绍
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