css原生输入框验证，:valid和:invalid
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2022-05-31 20:30:42
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Document</title>
</head>
<style>
input{
display: block;
padding: 0 20px;
outline: none;
border: 1px solid #ccc;
width: 150px;
height: 40px;
transition: all 300ms;
}
/*input内容合法时：边框颜色是绿色*/
input:valid {
border-color: green;
box-shadow: inset 5px 0 0 green;
}
/* input内容非法时：边框颜色是红色*/
input:invalid {
border-color: red;
box-shadow: inset 5px 0 0 red;
}
button{
width: 190px;
height: 40px;
background-color: green;
color: white;
margin-top: 20px;
}
</style>
<body>
<form>
<input type="text" maxlength="11" placeholder="请输入手机号码" pattern="^1[3456789]\d{9}$" required>
<button type="submit">提交</button>
</form>
</body>
</html>
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