abstract：<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>Title</title&g
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
<style type="text/css">
.big{width: 200px;height: auto;border: 1px solid #000;margin: 20px auto;text-align: center}
.big input{margin: 10px;}
</style>
<script type="text/javascript">
function checkAll() {
var all = document.getElementById('first_in');//获取
var one = document.getElementsByName('item');//通过获取name对应的input元素，可得到input的数量(前提是name值全都一样)
var x = 0;//getElementsByName获取到的是数组，所以要加[];x充当下标
while (x < one.length){
if (all.checked){
one[x].checked = true;
} else {
one[x].checked = false;
}
x++;
}
}
</script>
</head>
<body>
<div class="big">
<input type="checkbox" id="first_in" onclick="checkAll()" lick><lable for="first_in">全选</lable><hr>
<input type="checkbox" name="item">选项1<hr>
<input type="checkbox" name="item">选项2<hr>
<input type="checkbox" name="item">选项3<hr>
<input type="checkbox" name="item">选项4<hr>
<input type="checkbox" name="item">选项5<hr>
<input type="checkbox" name="item">选项6<hr>
<input type="checkbox" name="item">选项7<hr>
<input type="checkbox" name="item">选项8
</div>
</body>
</html>
Correcting teacher：查无此人Correction time：2019-03-26 09:12:58
Teacher's summary：完成的不错。js的标签获取，需要多练习，这个很重要，继续加油。