JS获取 data-age里面的1 2 3 4 5 分别乘以5赋值到sapn元素里面显示为 5 10 15 20 25
<div id="content">
<div class="name" data-age="1"><span class="age"></span></div>
<div class="name" data-age="2"><span class="age"></span></div>
<div class="name" data-age="3"><span class="age"></span></div>
<div class="name" data-age="4"><span class="age"></span></div>
<div class="name" data-age="5"><span class="age"></span></div>
</div>
参考下面例子
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
</head>
<body>
<div id="content">
<div class="name" data-age="1"><span class="age"></span></div>
<div class="name" data-age="2"><span class="age"></span></div>
<div class="name" data-age="3"><span class="age"></span></div>
<div class="name" data-age="4"><span class="age"></span></div>
<div class="name" data-age="5"><span class="age"></span></div>
</div>
<script>
var content = document.getElementById('content');
var names = content.getElementsByClassName('name');
for (var i = 0; i < names.length; i++) {
var age = names[i].getAttribute('data-age');
names[i].getElementsByClassName('age')[0].innerHTML = age * 5;
}
</script>
</body>
</html>
另一种方法：
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta http-equiv="X-UA-Compatible" content="IE=edge" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>Document</title>
</head>
<body>
<div id="content">
<div class="name" data-age="1"><span class="age"></span></div>
<div class="name" data-age="2"><span class="age"></span></div>
<div class="name" data-age="3"><span class="age"></span></div>
<div class="name" data-age="4"><span class="age"></span></div>
<div class="name" data-age="5"><span class="age"></span></div>
</div>
<script>
let list = document.querySelectorAll('#content .name')
list.forEach((item) => {
item.querySelector('.age').innerHTML = parseInt(item.dataset.age) * 5
})
</script>
</body>
</html>
