<!DOCTYPE html><html lang="en"><head><meta charset="UTF-8"><title>案例-全选 反选 取消</title></head><body><script type="text/javascript" src="../js/jquery.js"></script><script type="text/javascript">
function quanXuan(){
var v_ahObj=$(".ah");for(var i in v_ahObj){
$(v_ahObj[i]).attr("checked",true);}}
function fanXuan(){
var v_ahObj = $(".ah");for(var i in v_ahObj){
$(v_ahObj[i]).attr("checked",!$(this).attr("checked"));}}
function quXiao(){
var v_ahObj = $(".ah");for(var i in v_ahObj){
$(v_ahObj[i]).attr("checked",false);}}</script><input type="button" value="全选" onclick="quanXuan()"/><input type="button" value="反选" onclick="fanXuan()"/><input type="button" value="取消" onclick="quXiao()"/><br>
爱好:<input type="checkbox"class="ah">吃
<input type="checkbox"class="ah">喝
<input type="checkbox"class="ah">玩
<input type="checkbox"class="ah">乐
</body></html>