在输入密码时,将密码的长度设置为6-16,且在密码长度出现小于6或是大于16时,会出现提示,效果如下图
1. 此事件为失去焦点事件,当鼠标离开密码框且点击旁边就会触发事件
2. 输入密码会出现提示,事件发生与密码的长度有关
3. 根据长度再来判断该提示的消息与效果.
代码如下:
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<!doctype html>
<html lang= "en" >
<head>
<meta charset= "utf-8" >
<meta name= "viewport" content= "width=device-width, initial-scale=1.0" >
<meta http-equiv= "x-ua-compatible" content= "ie=edge" >
<title>密码框</title>
<style type= "text/css" >
div{
width: 600px;
margin: 100px auto;
}
.massage{
background-image: url(gth.png);
background-repeat:no-repeat;
background-position: left center;
color:black;
display: inline-block;
padding-left: 20px;
}
.right{
background-image: url(right.png);
background-repeat: no-repeat;
color: green;
}
.wrong{
background-repeat: no-repeat;
background-image: url(wrong.png);
color: red;
}
</style>
</head>
<body>
<div class= "register" >
<input type= "password" id= "pwd" >
<p class= "massage" >请输入6-16位密码</p>
</div>
<script>
var pwd=document.queryselector( '#pwd' );
var aa=document.queryselector( '.massage' );
pwd.onblur= function (){
if ( this .value.length>16 || this .value.length<6){
aa.innertext= '错误,请输入6-16为密码' ;
aa.classname= 'massage wrong' ;
} else {
aa.classname= 'massage right' ;
aa.innertext= '密码正确' ;
}
}
</script>
</body>
</html>
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以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持服务器之家。
原文链接:https://blog.csdn.net/weixin_46535360/article/details/108471017