radio实现第一次点击选中第二次点击取消

Jquery代码如下：

   
   
$( "#add_form .radio input").bind( "click", function(){
var $radio = $( this);
// if this was previously checked
if ($radio.data( 'waschecked') == true)
{
$radio.prop( 'checked', false);
$radio.data( 'waschecked', false);
}
else
{
$radio.prop( 'checked', true);
$radio.data( 'waschecked', true);
}
// remove was checked from other radios
$radio.siblings( 'input[type="radio"]').data( 'waschecked', false);
});