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<html>
<head>
<title>用户登录界面</title>
<meta charset="UTF-8"/>
<style type="text/css">
body{background: url(D:/SQL/ky1.jpg) no-repeat center 0;
background-size: 100%};
font{color="darkgray"};
tr{height:60px}
</style>
<!--声明js代码域-->
<script type="text/javascript">
//常见验证码
function createCode(){
//创建随机4位数字math.floor向下取整
var code=Math.floor(Math.random()*9000+1000);
//获取元素对象
var span=document.getElementById("codeSpan");
//将数字存放到span中
span.innerHTML=code;
//给span添加背景图片
}
//验证用户名
function checkUname(){
//获取用户获得用户名信息
var uname=document.getElementById("uname").value;
//创建校验规则,用户名2-4个
var reg=/^[2][0][1][7][1][3][9][1][9][0][0][4]$/
//获取span对象
var unameSpan=document.getElementById("unameSpan");
//开始交验
if(unameSpan==""||unameSpan==null){
//输入校验结果
unameSpan.innerHTML="*用户名不能为空";
unameSpan.style.color="red";
return false;
}else if(reg.test(uname)){
//输入校验结果
unameSpan.innerHTML="*用户名通过";
unameSpan.style.color="green";
return true;
}else{
//输入校验结果
unameSpan.innerHTML="*用户名格式不符"
unameSpan.style.color="red";
return false;
}
}
//验证密码
function checkPwd(){
//获取用户获得用户名信息
var upwd=document.getElementById("pwd").value;
//创建校验规则,密码要求6-8位首位为字母后面5-7位是数字
var reg=/^[0][9][7][3][5][4]$/;
//获取span对象
var span=document.getElementById("pwdSpan");
//开始交验
if(span==""||span==null){
//输入校验结果
span.innerHTML="*密码不能为空";
span.style.color="red";
return false;
}else if(reg.test(upwd)){
//输入校验结果
span.innerHTML="*密码通过";
span.style.color="green";
return true;
}else{
//输入校验结果
span.innerHTML="*密码格式不符"
span.style.color="red";
return false;
}
}
//校验确认验证码------------------
function checkCode(){
//获取用户输入验证码
var code=document.getElementById("code").value;
//获取随机验证码
var code2=document.getElementById("codeSpan").innerHTML;
//获取span对象
var span=document.getElementById("codeSpan2");
//比较前两次密码是否相同
if( code==""|| code==null){
//输入校验结果
span.innerHTML="*验证码不能为空";
span.style.color="red";
createCode();
return false;
}else if(code==code2){
//输入校验结果
span.innerHTML="*验证码通过";
span.style.color="green";
return true;
}else{
//输入校验结果
span.innerHTML="*验证码错误"
span.style.color="red";
createCode();
return false;
}
}
function checkSub(){
checkUname();
checkPwd();
checkCode();
return checkUname()&&checkPwd()&&checkCode();
}
//----------------------------------------------------------------------------------------------------------------------
//封装校验:相同的保留,不同的传参
function checkField(id,reg){
//获取用户数据
var inp=document.getElementById(id);
var va=inp.value;
var alt=inp.alt;
//创建校验规则
//获取span对象
var span=document.getElementById(id+"Span");
//开始校验
if(va==""||va==null){
//输入校验结果
span.innerHTML="*"+alt+"不能为空";
span.style.color="red";
return false;
}else if(reg.test(va)){
//输入校验结果
span.innerHTML="*"+alt+"通过";
span.style.color="green";
return true;
}else{
//输入校验结果
span.innerHTML="*"+alt+"格式不符";
span.style.color="red";
return false;
}
}
</script>
</head>
<body onload="createCode()">
<body style="background-color:lightgoldenrodyellow">
<div align="center">
<br>
<br>
<br>
<br>
<br>
<h1 >用户登录界面</h1>
<hr />
<form action="main page" method="get" onsubmit="return checkSub()">
<table border="0px" cellspacing="0" cellpadding="2px" >
<tr>
<td width="80px">用户名:</td>
<td width="400px">
<input type="text" name="uname" id="uname" value="" alt="用户名"/>
<span id="unameSpan">
</span>
</td>
</tr>
<tr>
<td>&nbsp;&nbsp;&nbsp;码:</td>
<td>
<input type="password" name="pwd" id="pwd" value="" />
<span id="pwdSpan">
</span>
</td>
</tr>
<tr>
<td>验证码:</td>
<td>
<input type="text" id="code" value="" style="width:100px;" />
<span id="codeSpan" style="background-image: url(img/背景.png);color: black;" onclick="createCode()">
</span>
<span id="codeSpan2"></span>
</td>
</tr>
<tr>
<td colspan="2" >
<input type="submit" id="sub" name="sub" value="登录" />
</td>
</tr>
</table>
</form>
</div>
</body>
</html>