Question

Jquery怎么获得复选框被选中的个数

Answer 1

<label><input type="checkbox" name="a" value="1">选项1</label>
<label><input type="checkbox" name="a" value="1">选项1</label>
<label><input type="checkbox" name="a" value="1">选项1</label>
<label><input type="checkbox" name="a" value="1">选项1</label>
<label><input type="checkbox" name="a" value="1">选项1</label>

<input type="button" onChange="cklen()" value="选中后点击检测个数">
//引入jQuery.js
<script>
function cklen(){
var len=$("input[name='a']checked").length;
alert("选中个数为："+len);
}
</script>

Answer 2

$(':checkbox:checked').length

Answer 3

jQuery("input[name='ck']:checked").length