整体代码
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
<style>
.box {
border: 1px solid #f2f2f2;
width: 100px;
height: 100px;
margin-left: 15px;
margin-top: 15px;
}
.name {
text-align: center;
margin-top: 40%;
color: white;
}
</style>
</head>
<body>
<div id="content"></div>
</body>
<script>
var div = document.createElement("div"); //创建一个标签
div.className = "box"; //给创建的div设置class;
var con = document.getElementById('content'); //获取标签
con.appendChild(div); //向刚获取的标签中添加创建的标签
var child = document.createElement("div"); //创建一个标签
child.className = "name"; //给创建的div设置class;
div.appendChild(child);
var color = document.getElementsByClassName('name')[0];
color.innerHTML = '元素';
div.style.backgroundColor = "#00FF7F";
</script>
</html>