<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
<style>
table
{
border-collapse: collapse;
}
td
{
border: 1px solid #000000;
width: 100px;
height: 30px;
text-align: center;
}
</style>
</head>
<body>
<table>
<tr>
<td>
<label for="allCheck">全選</label><br><input id="allCheck" type="checkbox">
</td>
</tr>
<tr>
<td>
<input id="check0" type="checkbox">
</td>
</tr>
<tr>
<td>
<input id="check1" type="checkbox">
</td>
</tr>
<tr>
<td>
<input id="check2" type="checkbox">
</td>
</tr>
<tr>
<td>
<input id="check3" type="checkbox">
</td>
</tr>
<tr>
<td>
<input id="check4" type="checkbox">
</td>
</tr>
</table>
<script>
var allCheck=document.getElementById("allCheck");
allCheck.addEventListener("click",clickHandler);
for(var i=0;i<5;i++){
var check=document.getElementById("check"+i);
check.addEventListener("click",clickHandler)
}
function clickHandler(e) {
if(this===allCheck){
for(var i=0;i<5;i++){
var check=document.getElementById("check"+i);
// 讓所有的多選框的checked都和全選的checked相同
check.checked=allCheck.checked;
}
return;//終結后面的代碼
}
for(var j=0;j<5;j++){
var checks=document.getElementById("check"+j);
if(!checks.checked){
allCheck.checked=false;
return;
}
}
allCheck.checked=true;
}
</script>
</body>
</html>
