js 复选框的多选反选

来源：互联网发布：乐视刷windows 编辑：程序博客网时间：2024/05/17 01:27
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8" /><title>无标题文档</title><style>div{background:#036; height:100px};</style><script>window.onload=function() //加载页面完毕后{//获取盒子var div1 = document.getElementById("div");//获取按钮var btn1 = document.getElementById('btn1');var btn2 = document.getElementById('btn2');var btn3 = document.getElementById('btn3');//获取选项组 var ch = div1.getElementsByTagName('input');div1.style.background="red"; //改变div需要.stylebtn1.onclick = function(){for (var i=0; i<ch.length; i++){ch[i].checked = true;}};btn2.onclick = function(){for (var i=0; i<ch.length; i++){ch[i].checked = false;}};btn3.onclick = function(){for (var i=0; i<ch.length; i++){if(ch[i].checked == true){ch[i].checked = false;}else{ch[i].checked = true;}}};};</script></head><body><input id="btn1" type="button" value="全选"><input id="btn2" type="button" value="不选"><input id="btn3" type="button" value="反选">    <div id="div">    <input type="checkbox">        <input type="checkbox">        <input type="checkbox">        <input type="checkbox">        <input type="checkbox">    </div></body></html>
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