老师，用户名和密码不验证是什么原因？

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<!DOCTYPE html>
<html>
<head>
    <meta charset="utf-8">
    <title>正则表达式-重复</title>
    <style type="text/css">
        .wrap{
            width: 1200px;
            height: auto;
            margin: auto auto;
            background-color: #eee;
            overflow: hidden;
        }
        .wrap .top{
            width: 100%;
            height: 30px;
            background-color: #0099CC;
            margin-left:0;
            padding: 0;
        }
        .wrap .top p{
            color: #fff;
            margin-left: 30px;
            line-height: 30px;
            margin:0;
            padding-left: 30px;
        }
        .wrap #regexp{
            width: 500px;
            margin: 50px auto;
            overflow: hidden;
        }
        .wrap #regexp .unify{
            color: #999;
            display: block;
            margin-top: 30px;
        }
        .wrap #regexp .uniform{
            width: 200px;
            height: 20px;
            resize: none;
            vertical-align:middle;
        }
        .wrap #regexp #button{
            width: 80px;
            height: 40px;
            border-radius: 5px;
            background-color: #006699;
            margin: 50px auto;
            margin-top: 80px;
            cursor:pointer;
            margin-left: 150px;
        }
        .wrap #regexp #button p{
            line-height: 40px;
            text-align: center;
            color: #fff;
        }
        .verification{
             width: 280px;
               color: red;
               font-size: 12px;
               text-align: left;
               margin-bottom: 4px;
        }
    </style>
</head>
<body>
    <div class="wrap">
        <div class="top"><p>用户注册</p></div>
        <div id="regexp">
            <p class="unify">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;用户名：&nbsp;&nbsp;<input type = "text" class="uniform" id="username"></input><span class="verification"></span></p>
 
            <p class="unify">&nbsp;&nbsp;&nbsp;登录密码：&nbsp;&nbsp;<input type = "password" class="uniform" id="password"></input><span class="verification"></span></p>
 
            <p class="unify">&nbsp;&nbsp;&nbsp;确认密码：&nbsp;&nbsp;<input type = "password" class="uniform" id="confirmPassword"></input><span class="verification"></span></p>
 
            <p class="unify">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;姓名：&nbsp;&nbsp;<input type = "text" class="uniform" id="realName"></input><span class="verification"></span></p>
 
            <p class="unify">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;性别：&nbsp;&nbsp;<select class="uniform" id="sex">
                <option value="nan">男</option>
                <option value="nv">女</option>
            </select><span class = "verification"></span></p>
 
            <p class="unify">身份证号码：<input type = "text" class="uniform" id="idNumber"></input><span class="verification"></span></p>
 
            <p class="unify">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;邮箱：&nbsp;&nbsp;<input type = "text" class="uniform" id="email"></input><span class="verification"></span></p>
 
            <p class="unify">&nbsp;&nbsp;&nbsp;手机号码：&nbsp;&nbsp;<input type = "text" class="uniform" id="phone"></input><span class="verification"></span></p>
 
            <div id="button" ><p>提交</p></div>
        </div>
    </div>
    <script>
        var username =       document.getElementById('username'),
            password =        document.getElementById('password'),
            confirmPassword = document.getElementById('confirmPassword'),
            realName =        document.getElementById('realName'),
            sex =             document.getElementById('sex'),
            idNumber =        document.getElementById('idNumber'),
            email =       document.getElementById('email'),
            phone =       document.getElementById('phone'),
            button =      document.getElementById('button'),
            veri =            document.getElementsByClassName("verification");
        var pattern = {
            username:/^[a-z]\w{6,20}$/,
            password:/^\S{6,16}$/,
            confirmPassword:/^\S{6,16}&/,
            realName:/^[\u4e00-\u9fa5]{2,4}$/,
            idNumber:/^[0-9]{15}$|^[0-9]{18}$|^[0-9]{17}X$|^[0-9]{16}$/,
            email:/(?:\w+\.)*\w+@(?:\w+\.)+[a-z]/i,
            phone:/^13\d{9}$|^147\d{9}$|^15[0,1,2,3,4,6,7,8,9]{1}\d{8}$|^182\d{8}$|^18[5-9]\d{8}$|^180\d{8}$/
        }
        var allElem = [];
        var flag = false,
            flag1 = false,
            flag2 = false,
            flag3 = false,
            flag4 = false,
            flag5 = false,
            flag6 = false,
            flag7 = false;
        username.onblur = function(){
            if(username.value.match(pattern.username)){
                veri[0].innerHTML = "OK";
                flag = true;
            }else{
                veri[0].innerHTML = "请输入6-20位字母，数字下划线";
                flag = false;
            }
        }
        password.onblur = function(){
            if(password.value.match(pattern.password)){
                veri[1].innerHTML = "OK";
                flag1 = true;
            }else{
                veri[1].innerHTML = "请设置密码";
                flag1 = false;
            }
        }
        confirmPassword.onblur = function(){
            if(password.value == confirmPassword.value){
                veri[2].innerHTML = "OK";
                flag2 = true;
            }else{
                veri[2].innerHTML = "两次输入的密码不一致";
                flag2 = false;
            }
        }
        realName.onblur = function(){
            if(realName.value.match(pattern.realName)){
                veri[3].innerHTML = "OK";
                flag3 = true;
            }else{
                veri[3].innerHTML = "请输入2-4位汉字";
                flag3 = false;
            }
        }
        idNumber.onblur = function(){
            if(idNumber.value.match(pattern.idNumber)){
                veri[5].innerHTML = "OK";
                flag4 = true;
            }else{
                veri[5].innerHTML = "请输入正确的身份证号码";
                flag4 = false;
            }
        }
        email.onblur = function(){
            if(email.value.match(pattern.email)){
                veri[6].innerHTML = "OK";
                flag5 = true;
            }else{
                veri[6].innerHTML = "请输入正确的邮箱地址";
                flag5 = false;
            }
        }
        phone.onblur = function(){
            if(phone.value.match(pattern.phone)){
                veri[7].innerHTML = "OK";
                flag5 = true;
            }else{
                veri[7].innerHTML = "请输入正确的手机号码";
                flag5 = false;
            }
        }
        button.addEventListener("click",function(){
                if(flag == true && flag1 == true && flag2 == true && flag3 == true && flag4 == true && flag5 == true && flag6 == true){
                    alert("成功");
                }else{
                    alert("验证失败");
                }
            });
    </script>
</body>
</html>