模拟点击事件动态增删元素

<tr>    <td align="right">商品图像</td>    <td>        <a href="javascript:void(0)" id="selectFileBtn">添加附件</a>        <div id="attachList" class="clear"></div>    </td></tr>
<script type="text/Javascript">	$("#selectFileBtn").click(function(event) {		$fileFiled=$('<input type="file" name="thumbs[]"/>' );		$fileFiled.hide();		$("#attachList").append($fileFiled);		$fileFiled.change(function(event) {			//console.log("change");			$path=$(this).val();				$filename=$path.substring($path.lastIndexOf("//")+1);			if($path!=""){			$attachItem=$('<div class="attachItem"><div class="left">a.gif</div><a href="javascript:void(0)" title="删除附件">删除</a></div>');			$attachItem.find(".left").html($filename);			$("#attachList").append($attachItem);			$a=$("#attachList>.attachItem").find("a");			//console.log("第二次算a数量为："+$a.length);			$a.click(function(){			    //console.log("触发了click事件");			    $(this).parents('.attachItem').PRev('input').remove();				$(this).parents('.attachItem').remove();				})			}		});		//注意，trigger()写在change后面，否则有些浏览器会出现问题		$fileFiled.trigger('click');		//$fileFiled.trigger('change');  //egde 浏览器不写这句不能显示？！		$a=$("#attachList>.attachItem").find("a");		if($a.length==0){			//console.log("a数量为零，再次手动触发change事件");			$fileFiled.trigger('change');		}			//event.stopPropagation();	});</script>