checkbox全部选中或者取消
<html><head> <script type="text/javascript"> function checkAll(field){ var checkboxes = document.getElementsByName("choice"); for(var i=0;i<checkboxes.length;i++){ checkboxes[i].checked = field.checked; } } </script> </head> <body> <div><table width="100%" border="1" cellpadding="1" style="text-align:center"> <tr> <td><input id="allchecked" type="checkbox" onclick="checkAll(this);">全选</td> <td><b>产品名称</b></td> <td><b>价格（元）</b></td> <td><b>数量</b></td> </tr> <tr> <td><input name="choice" type="checkbox"></td> <td>李宁</td> <td>300</td> <td>500</td> </tr> <tr> <td><input name="choice" type="checkbox"></td> <td>耐克</td> <td>600</td> <td>500</td> </tr> <tr> <td><input name="choice" type="checkbox"></td> <td>以纯</td> <td>200</td> <td>500</td> </tr> <tr> <td><input name="choice" type="checkbox"></td> <td>森马</td> <td>200</td> <td>500</td> </tr> <tr> <td><input name="choice" type="checkbox"></td> <td>美特</td> <td>200</td> <td>500</td> </tr> <tr> <td><input name="choice" type="checkbox"></td> <td>真维斯</td> <td>200</td> <td>500</td> </tr></table></div> </body></html>
