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