jQuery实现简单二级下拉菜单

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<script type="text/javascript"> // 【经典】弹出层菜单 $(document).ready(function(){   var objStr = ".UpLayer";   $(objStr).each(function(i){     $(this).click(function(){       $($(objStr+" dd")[i]).show();       $($(objStr+" dt")[i]).addClass("UpLayer02");     });     $(this).hover(function(){},function(){       $($(objStr+" dd")[i]).hide();       $($(objStr+" dt")[i]).removeClass("UpLayer02");     });    }); }); </script> 

body,h1,h2,h3,h4,h5,h6,p,ol,ul,li,dl,dt,dd{padding:0;margin:0;} li{list-style:none;} img{border:none;} u{text-decoration:none;} em{font-style:normal;} a{color:#424242;text-decoration:none;outline:none;blr:expression(this.onFocus=this.blur());} body{font-size:12px;font-family: Arial,Verdana, Helvetica, sans-serif; word-break:break-all;} .box{margin:0 auto;text-align:left;width:920px;} .clear{clear:both;} /* 【经典】弹出层菜单 */ .UpLayer{ margin:100px;} .UpLayer dl dt{width:50px;position:absolute; z-index:3;padding:0 5px;line-height:20px;} .UpLayer02{border:#ccc 1px solid; border-bottom:none;background:#f1f1f1; margin:-1px 0 0 -1px;} .UpLayer dl dd{ width:80px;position:absolute;z-index:2;border:#ccc 1px solid;padding:5px; line-height:20px; background:#f1f1f1; display:none; margin:19px 0 0 -1px;} .UpLayer dl dd a{ display:block;border-bottom:#ccc 1px dashed;}