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| <!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
</head>
<body>
<button id="all">全选</button>
<button id="fan">反选</button>
<input type="checkbox" id="i1"/>
<ul>
<li><input type="checkbox"/>洗jio</li>
<li><input type="checkbox" />按摩</li>
<li><input type="checkbox" />拔罐</li>
<li><input type="checkbox" />刮痧</li>
<li><input type="checkbox" />推背</li>
<li><input type="checkbox" />马萨基</li>
<li><input type="checkbox" />spa</li>
</ul>
</body>
</html>
<script type="text/javascript">
var allCheckBox = document.getElementsByTagName("ul")[0].getElementsByTagName("input");
all.onclick = function(){
for(var i = 0; i < allCheckBox.length; i++){
allCheckBox[i].checked = true;
}
i1.checked = true;
}
fan.onclick = function(){
var count = 0;
for(var i = 0; i < allCheckBox.length; i++){
allCheckBox[i].checked = !allCheckBox[i].checked;
if(allCheckBox[i].checked == true){
count++;
}
}
if(count == allCheckBox.length){
i1.checked = true
}else{
i1.checked = false;
}
}
for(var i = 0; i < allCheckBox.length; i++){
allCheckBox[i].onclick = function(){
var count = 0;
for(var j = 0; j < allCheckBox.length; j++){
if(allCheckBox[j].checked == true){
count++;
}
}
if(allCheckBox.length == count){
i1.checked = true;
}else{
i1.checked = false;
}
}
}
</script>
|
