js this函数调用无需再次抓获id，name或标签名

<input type="button" id="tianjia" value="保 存" class="btn1" onClick="nullCheck(this)"/> 
<script> 
function nullCheck(obj) 
{ 
......//这里写你所需功能的代码 
} 
</script> 

<input type="checkbox" name='agentType' id="exclusiveAgenter" value="exclusive" onchange="clickAgenter(this)"> 

function clickAgenter(obj){ 
if($(obj).attr("checked")=="checked"){ 
$("[name='agentType']").removeAttr("checked");//取消全选 
$(obj).attr("checked","checked") 
} 
}