样式操作
dom标签对象操作样式
style是样式对象
示例
<!doctype html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport"
content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Document</title>
</head>
<body>
<button>我要留言</button>
<input type="text" id="msg" value="请输入内容">
<script>
var btn = document.querySelector("button")
var msg = document.querySelector("#msg")
btn.onclick = function () {
msg.style.height = "300px"
msg.style.backgroundColor = "gold"
}
</script>
</body>
</html>
操作类
