默认状态下：
勾选全选时：
任意取消勾选物品A/物品B/物品C时
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>全选</title>
<script>
function myAll() {
var all = document.getElementById("all");
var oneList = document.getElementsByName("one");
for(var i = 0; i < oneList.length; i++) {
oneList[i].checked = all.checked;
}
}
function myOne() {
var all = document.getElementById("all");
var oneList = document.getElementsByName("one");
for(var i = 0; i < oneList.length; i++) {
if(oneList[i].checked == false) {
all.checked = false;
return;
}
}
all.checked = true;
}
</script>
</head>
<body>
<table id="myTable" border="1" cellpadding="0" cellspacing="0" width="90%" height="180px">
<tr>
<th>全选<input id="all" type="checkbox" onclick="myAll()" /></th>
<th>序号</th>
<th>名称</th>
<th>单价</th>
<th>数量</th>
<th>总计</th>
</tr>
<tr>
<td><input name="one" type="checkbox" onclick="myOne()" /></td>
<td>1</td>
<td>物品A</td>
<td>￥55</td>
<td>1</td>
<td>￥55</td>
</tr>
<tr>
<td><input name="one" type="checkbox" onclick="myOne()" /></td>
<td>2</td>
<td>物品B</td>
<td>￥70</td>
<td>1</td>
<td>￥70</td>
</tr>
<tr>
<td><input name="one" type="checkbox" onclick="myOne()" /></td>
<td>3</td>
<td>物品C</td>
<td>￥66</td>
<td>1</td>
<td>￥66</td>
</tr>
</table>
</body>
</html>
