一.JQuery实现全选功能：
<!DOCTYPE HTML>
<html lang="en-US">
<head>
<meta charset="UTF-8">
<title>checkbox</title>
</head>
<body>
<input type="checkbox" name="btn" id="btn"/><label for="btn">全选/全不选</label><br/>
<input type="checkbox" name="choose" id="checkbox1"/><label for="checkbox1">选项1</label><br/>
<input type="checkbox" name="choose" id="checkbox2"/><label for="checkbox2">选项2</label><br/>
<input type="checkbox" name="choose" id="checkbox3"/><label for="checkbox3">选项3</label><br/>
<input type="checkbox" name="choose" id="checkbox4"/><label for="checkbox4">选项4</label><br/>
<input type="checkbox" name="choose" id="checkbox5"/><label for="checkbox5">选项5</label><br/>
<input type="checkbox" name="choose" id="checkbox6"/><label for="checkbox6">选项6</label><br/>
<a href="javascript:;" id="btn2">反选</a>
</body>
</html>
<script type="text/javascript" src="/js/jquery-1.6.1.min.js"></script>
<script type="text/javascript">
$(function(){
var checkboxes = $('input[name=choose]');
var btn = $('#btn');
var btn2 = $('#btn2');
btn.click(function(){
checkboxes.attr('checked',this.checked);
});
checkboxes.click(function(){
var flag = true;
checkboxes.each(function(){
if(!this.checked) flag = false;
});
btn.attr('checked',flag);
});
btn2.click(function(){
var flag = true;
checkboxes.each(function(){
this.checked = !this.checked;
if(!this.checked) flag = false;
});
btn.attr('checked',flag);
});
});
</script>
二.JavaScript实现全选功能：
<!DOCTYPE HTML>
<html lang="en-US">
<head>
<meta charset="UTF-8">
<title>checkbox</title>
</head>
<body>
<input type="checkbox" name="btn" id="btn"/><label for="btn">全选</label><br/>
<input type="checkbox" name="choose" id="checkbox1"/><label for="checkbox1">选项1</label><br/>
<input type="checkbox" name="choose" id="checkbox2"/><label for="checkbox2">选项2</label><br/>
<input type="checkbox" name="choose" id="checkbox3"/><label for="checkbox3">选项3</label><br/>
<input type="checkbox" name="choose" id="checkbox4"/><label for="checkbox4">选项4</label><br/>
<input type="checkbox" name="choose" id="checkbox5"/><label for="checkbox5">选项5</label><br/>
<input type="checkbox" name="choose" id="checkbox6"/><label for="checkbox6">选项6</label><br/>
<a href="javascript:;" id="btn2">反选</a>
</body>
</html>
<script type="text/javascript">
window.onload = function(){
var oBtn = document.getElementById('btn');
var oBtn2 = document.getElementById('btn2');
var oInput = document.getElementsByName('choose');
for(var i = 0;i < oInput.length; i++){
oInput[i].onclick = function(){
this.checked ? allCheck() : oBtn.checked = false;
};
};
//全选
oBtn.onclick = function(){
for(var i = 0;i < oInput.length; i++){
oBtn.checked ? oInput[i].checked = true : oInput[i].checked = false;
};
};
//反选
oBtn2.onclick = function(){
for(var i = 0;i < oInput.length; i++){
oInput[i].checked = !oInput[i].checked;
};
allCheck();
};
};
//判断是否全选
function allCheck(){
var oBtn = document.getElementById('btn');
var oInput = document.getElementsByName('choose');
var allCheck = true;
for(var i = 0;i < oInput.length; i++){
if(!(oInput[i].checked)) allCheck = false;
};
allCheck ? oBtn.checked = true : oBtn.checked = false;
};
</script>
