[转]javascript应用:实现复选框全选/全不选切换 <input type=checkbox name=mm value=a onclick="checkItem(this, 'mmAll')"><br><input type=checkbox name=mm value=b onclick="checkItem(this, 'mmAll')"><br><input type=checkbox name=mm value=c onclick="checkItem(this, 'mmAll')"><br><input type=checkbox name=mm value=d onclick="checkItem(this, 'mmAll')"><br><input type=checkbox name=mm value=e onclick="checkItem(this, 'mmAll')"><br><br><input type=checkbox name=mmAll onclick="checkAll(this, 'mm')">全选与不全选的切换<script language=Javascript>function checkAll(e, itemName){ var aa = document.getElementsByName(itemName); for (var i=0; i<aa.length; i++) aa[i].checked = e.checked;}function checkItem(e, allName){ var all = document.getElementsByName(allName)[0]; if(!e.checked) all.checked = false; else { var aa = document.getElementsByName(e.name); for (var i=0; i<aa.length; i++) if(!aa[i].checked) return; all.checked = true; }}</script> ps:(当然若那个全选框是其它的控件比如是一个按钮,或者一个链接什么的话,那复选框里的 checkItem 点击事件可以去掉,以免出错)