is on, then you will receive a &quot; 1 &quot; for marked check boxes, a &quot; 0 &quot; for unmarked check boxes, and an empty string for undefined (tri-state) check boxes. If the search has been carried out with
打开，对于已选中的复选框将得到 &quot; 1 &quot; ，对于未选中的复选框将得到 &quot; 0 &quot; ，对于未定义的（三重状态）复选框将得到一个空字符串。如果将