<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>
<style>
div {
width: 600px;
margin: 100px auto;
}
.message {
display: inline-block;
font-size: 16px;
color: #999;
background: url(images/mess.png) no-repeat left center;
padding-left: 20px;
background-size: 20px;
}
.wrong {
color: red;
background: url(images/wrong.png) no-repeat left center;
background-size: 20px;
}
.right {
color: green;
background: url(images/right.png) no-repeat left center;
background-size: 20px;
}
</style>
</head>
<body>
<div class="register">
<input type="password" class="ipt">
<p class="message">请输入6-16位密码</p>
<script>
// 事件源
var ipt = document.querySelector('.ipt')
var message = document.querySelector('.message')
// 注册事件失去焦点
ipt.onblur = function () {
if (ipt.value.length < 6 || ipt.value.length > 16) {
message.innerHTML = '请输入6-16位密码'
message.className = 'message wrong'
} else {
message.className = 'message right'
message.innerHTML = '输入正确'
}
}
</script>
</div>
</body>
原创文章，作者：bd101bd101，如若转载，请注明出处：https://blog.ytso.com/tech/pnotes/278133.html