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多选框

<html><head><meta http-equiv="Content-Type" content="text/html; charset=gb2312"><title>复选框全选、全不选和反选的效果实现</title><SCRIPT LANGUAGE="JavaScript"><!-- Beginfunction checkAll() {for (var j = 1; j <= 9; j++) {box = eval("document.checkboxform.C" + j); if (box.checked == false) box.checked = true;   }}function uncheckAll() {for (var j = 1; j <= 9; j++) {box = eval("document.checkboxform.C" + j); if (box.checked == true) box.checked = false;   }}function switchAll() {for (var j = 1; j <= 9; j++) {box = eval("document.checkboxform.C" + j); box.checked = !box.checked;   }}//  End --></script></head><body><form name=checkboxform><input type=checkbox name=C1 checked>C1<br><input type=checkbox name=C2 checked>C2<br><input type=checkbox name=C3 checked>C3<br><input type=checkbox name=C4 checked>C4<br><input type=checkbox name=C5 checked>C5<br><input type=checkbox name=C6 checked>C6<br><input type=checkbox name=C7 checked>C7<br><input type=checkbox name=C8 checked>C8<br><input type=checkbox name=C9 checked>C9<br><br><input type=button value="全部选中" onClick="checkAll()"><br><input type=button value="全部不选" onClick="uncheckAll()"><br><input type=button value="选择转换" onClick="switchAll()"><br></form><p><a href="http://www.lanrentuku.com" target="_blank">懒人图库</a></p></body></html>

 

多选框