JQuery 获取选中checkbox值

.each:http://api.jquery.com/each/

Description: Iterate over a jQuery object, executing a function for each matched element.

The .each() method is designed to make DOM looping constructs concise and less error-prone. When called it iterates over the DOM elements that are part of the jQuery object. Each time the callback runs, it is passed the current loop iteration, beginning from 0. More importantly, the callback is fired in the context of the current DOM element, so the keyword this refers to the element.

1：

var str=''
$('input[name="check"]:checked').each(function(){
   str+=$(this).val()+','; 				//获取选中元素的值
   alert(str);
 }); 

其中以上代码等效：

function checkeds()  
{  
 $("input:checkbox").each(function(index)  
   {  
       alert($("#checkid_"+index).val());//"#checkid_"+index  checkbox的id  
   });  
  
}  

<input type="checkbox" id="checkid" name="check" class="itopself_checkbox"  onclick="checkeds()"/>  
  
<input type="checkbox" id="checkid" name="check" class="topself_checkbox"  onclick="checkeds()"/>