表单的取消和全选
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<body><div class&＃61;" wrop"><table><thead><tr><th><input type&＃61;"checkbox" id&＃61;"all_cheack"> th><th>标题1th><th>标题1th>tr> thead><tbody><tr><td> <input type&＃61;"checkbox" class&＃61;"a_cheack"> td><td>手机2td><td>手机3td>tr><tr><td> <input type&＃61;"checkbox" class&＃61;"a_cheack"> td><td>手机2td><td>手机3td>tr><tr><td> <input type&＃61;"checkbox" class&＃61;"a_cheack"> td><td>手机2td><td>手机3td>tr>tbody>table>div>body>
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