<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>JavaScript</title>
</head>
<body>
<p id="demo">time</p>
<script>
document.write(Date()).innerHTML = aaabbbaa;
document.getElementById("demo").innerHTML = 123456789;
</script>
<button type="button" onclick=window.alert("number")>press</button>
</body>
</html>
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<!doctype html>
<html lang="em">
<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>登录</title>
<link rel="stylesheet" type="text/css" href="../static/css/styles.css">
<script>
function fnLogin() {
var oUname = document.getElementById("uname")
var oError = document.getElementById("error_box")
var oUpass = document.getElementById("upass")
if(oUname.value.length<6 ){
oError.innerHTML="用户名至少6位"
}
if(oUname.value.length >12){
oError.innerHTML="用户名最多12位"
}
if(oUpass.value.length<6){
oError.innerHTML="密码至少6位"
}
if(oUpass.value.length>12){
oError.innerHTML="密码最多12位"
}
}
</script>
</head>
<body class="body">
<div class="box">
<h2 class="ziti">登录</h2>
<div class="input_box">
<input id="uname" type="text" placeholder="请输入用户名">
</div><br>
<div class="input_box">
<input id="upass" type="password" placeholder="请输入密码">
</div>
<div id="error_box"><br></div>
<div class="input_box">
<button onclick="fnLogin()">登录</button>
</div>
</div>
</body>
</html>
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