css部分>>

body{
background:url("../image/10.png") repeat-x;
}
#section{
  width:1002px;
  height:612px;
  margin:15px auto;
  position:relative;
}
#table{
  width:600px;
  height:550px;
  background-color:#fff;
  position:absolute;
  font-size:18px;
  line-height:5px;
  border-radius: 5px;
  box-shadow: 0 0 15px 2px rgba(0, 0, 0, 0.4);
  padding: 20px 30px;
  box-sizing: border-box;
  width: 80%;
  margin: 0 10%;
}
#table .pwstrength{
  float:left;
  height:30px;
  width:60px;
  line-height:30px;
  text-align:center;
  border-radius:4px;
  color:#000;
}
#table .text{
  width:215px;
  height:32px;

}
#password{
  width:215px;
  height:32px;

}
#table .lasttext{
  font-size:14px;
}
#table tr td{
  width:180px;
}
#table .icon{
  width:175px;
  height:24px;
  float:left;
  background:no-repeat;
  font-size:12px;
  color:#000;
  text-align:right;
  line-height:24px;
}

javascript部分，这边使用的是dom2级操作，先封装好事件对象，在IE和非IE的情况下进行操作

//封装一下兼容性函数
  var EV ={
    //绑定事件兼容
    addEvent:function(node,ename,fn){
      if(navigator.userAgent.toLowerCase().indexOf("ie")!=-1){       //在ie下添加绑定事件
        node.attachEvent("on"+ename,fn);
      }else{
        node.addEventListener(ename,fn,false);
      }
    },
    removeEvent:function(node,ename,fn){
      if(navigator.userAgent.toLowerCase().indexOf("ie")!=-1){       //在ie下添加绑定事件
        node.detachEvent("on"+ename,fn);
      }else{
        node.removeEventListener(ename,fn,false);
      }
    }
  }
window.onload=function(){
//email地址检测 html事件处理
  var eMail = document.getElementById("email");
  EV.addEvent(eMail,"blur",checkEmail);
  function checkEmail(){ 
    var email = document.getElementById("email").value;
    var emailicon = document.getElementById("emailicon");
    var epatt = new RegExp("\\w+@[a-zA-Z0-9]+\\.[a-zA-Z0-9]{2,14}");
                          //利用正则表达式
    if(epatt.test(email)){
      emailicon.style.backgroundImage="url('image/tick.png')";
      emailicon.innerHTML="";
    }
    else{
      emailicon.style.backgroundImage="url('image/cross.png')";
      emailicon.innerHTML="请输入正确的邮箱地址!";
      emailicon.style.color="#dd0000";
    }
  }
//密码强度检测
  var pwd =document.getElementById("password");
  EV.addEvent(pwd,"blur",checkCode);
  function checkCode(){
    var pwdv =document.getElementById("password").value;
    var low =document.getElementById("low");
    var middle =document.getElementById("middle");
    var strong =document.getElementById("strong");
    var pwssicon =document.getElementById("phoneicon");
    var pwdpatt1 = /\d+/g; //数字
    var pwdpatt2 = /[a-zA-Z]+/g; //字母
    var pwdpatt3 = /(\W)+/g; //特殊字符
    var booldata1,booldata2,booldata3;
    if(pwdv.length<6){
      pwicon.style.backgroundImage="url('image/cross.png')";
      pwicon.innerHTML="密码不得少于6位数!";
      pwicon.style.color="#dd0000";
    }
    if(pwdv==""){
      pwicon.style.backgroundImage="url('image/cross.png')";
      pwicon.innerHTML="密码项不能为空!";
      pwicon.style.color="#dd0000";
    }
    if(pwdpatt1.test(pwdv)){
      booldata1 = true;
    }
    if(pwdpatt2.test(pwdv)){
      booldata2 = true;
    }
    if(pwdpatt3.test(pwdv)){
      booldata3 = true;
    }

      if(booldata1||booldata2||booldata3){
        low.style.backgroundColor="#CB4042";
        pwicon.style.backgroundImage="url('image/tick.png')";
        pwicon.innerHTML="";
      }                    //强度低

      if((booldata1&&booldata2)||(booldata1&&booldata3)||(booldata3&&booldata2)){
        middle.style.backgroundColor="#F7C242"; 
        pwicon.style.backgroundImage="url('image/tick.png')";
        pwicon.innerHTML="";        //强度中
      }
      if(booldata1&&booldata2&&booldata3){
        strong.style.backgroundColor="#227D51";
        pwicon.style.backgroundImage="url('image/tick.png')"; 
        pwicon.innerHTML="";              //强度强
      }
    } 

    //检测QQ号码
    var qq =document.getElementById("qq");
    EV.addEvent(qq,"blur",checkQQ);
    function checkQQ(){
      var qqicon =document.getElementById("qqicon");
      var qqtext =document.getElementById("qq").value;
      var qqpatt = /^[1-9](\d{5,10})$/;
      if(qqpatt.test(qqtext)){
        qqicon.style.backgroundImage="url('image/tick.png')";
        qqicon.innerHTML="";
      }
      else{
        qqicon.style.backgroundImage="url('image/cross.png')";
        qqicon.innerHTML="请输入5至11位数的QQ号码";
        qqicon.style.color="#dd0000";
      }
    }
    //检测手机号 
    var phone = document.getElementById("phone");
    EV.addEvent(phone,"blur",checkPhone);
      function checkPhone(){
        var phoneicon =document.getElementById("phoneicon");
        var phonenum = document.getElementById("phone").value;
        var phonepatt = /^0?(13|15|14|18)[0-9]{9}$/;
        if(phonepatt.test(phonenum)){
          phoneicon.style.backgroundImage="url('image/tick.png')";
          phoneicon.innerHTML="";
        }
        else{
          phoneicon.style.backgroundImage="url('image/cross.png')";
          phoneicon.innerHTML="请输入正确的手机号!";
          phoneicon.style.color="#dd0000";
        }
      }

  //检测用户名
    var username = document.getElementById("username");
    EV.addEvent(username,"blur",checkUser);
    function checkUser(){
      var usercon = document.getElementById("username").value;
      var usernameicon =document.getElementById("usernameicon");
      var unpatt = /[A-Za-z0-9_\-\u4e00-\u9fa5]{6,18}/;
      if(unpatt.test(usercon)){
        usernameicon.style.backgroundImage="url('image/tick.png')";
        usernameicon.innerHTML="";
      }
      else{
        usernameicon.style.backgroundImage="url('image/cross.png')";
        usernameicon.innerHTML="用户名至少大于6个字符!";
        usernameicon.style.color="#dd0000";
      if(usercon==""){
        usernameicon.style.backgroundImage="url('image/cross.png')";
        usernameicon.innerHTML="用户名不能为空!";
        usernameicon.style.color="#dd0000";
      }
    }
  //确认密码
    var Cfpw =document.getElementById("cfpw");
    EV.addEvent(Cfpw,"blur",cfPw);
    function cfPw(){
      var cfpw =document.getElementById("cfpw").value;
      var cfpwicon=document.getElementById("cfpwicon");
      var pwd =document.getElementById("password").value;
      if(cfpw==pwd&&cfpw!=""){
        cfpwicon.style.backgroundImage="url('image/tick.png')";
        cfpwicon.innerHTML="";
      }else{
        cfpwicon.style.backgroundImage="url('image/cross.png')";
        cfpwicon.innerHTML="输入的密码不一致!";
        cfpwicon.style.color="#dd0000";
      }
    }
  //MSN
    var Msn = document.getElementById("msn");
    EV.addEvent(Msn,"blur",checkMsn);
    function checkMsn(){
      var msn =document.getElementById("msn").value;
      var msnicon =document.getElementById("msnicon");
      var msnpatt = /\w+@[a-zA-Z0-9]+\.[a-zA-Z0-9]{2,14}/;
      if(msnpatt.test(msn)){
        msnicon.style.backgroundImage="url('image/tick.png')";
        msnicon.innerHTML="";
      }else{
        msnicon.style.backgroundImage="url('image/cross.png')";
        msnicon.innerHTML="msn应为正确邮箱地址!";
        msnicon.style.color="#dd0000";
      }
    }  
  //办公电话
    var officephone =document.getElementById("offphone");
    EV.addEvent(officephone,"blur",checkoffPhone);
    function checkoffPhone(){
      var offphone = document.getElementById("offphone").value;
      var offphoneicon =document.getElementById("offphoneicon");
      var offpatt = /(\(\d{3,4}\)|\d{3,4}-)?\d{8}/;
      if(offpatt.test(offphone)){
        offphoneicon.style.backgroundImage="url('image/tick.png')";
        offphonecon.innerHTML="";
      }else{
        offphoneicon.style.backgroundImage="url('image/cross.png')";
        offphoneicon.innerHTML="例:010-88888888";
        offphoneicon.style.color="#dd0000";
      }
    }
  //家庭电话
    var Homephone =document.getElementById("homephone");
    EV.addEvent(Homephone,"blur",checkHomephone);
    function checkHomephone(){
      var homephone =document.getElementById("homephone").value;
      var homephoneicon =document.getElementById("homephoneicon");
      var homepatt = /(\(\d{3,4}\)|\d{3,4}-)?\d{8}/;
      if(homepatt.test(homephone)){
        homephoneicon.style.backgroundImage="url('image/tick.png')";
        homephonecon.innerHTML="";
      }else{
        homephoneicon.style.backgroundImage="url('image/cross.png')";
        homephoneicon.innerHTML="例:010-88888888";
        homephoneicon.style.color="#dd0000";
      }
    }
  //问题答案
      function checkAnswer(){
      var answer =document.getElementById("answer").value;
      var answericon =document.getElementById("answericon");
      if(answer!=""){
        answericon.style.backgroundImage="url('image/tick.png')";
        answercon.innerHTML="";
      }else{
        answericon.style.backgroundImage="url('image/cross.png')";
        answericon.innerHTML="密码问题答案不能为空!";
        answericon.style.color="#dd0000";
      }
    }
  //登录注册
      var login =document.getElementById("login");
      EV.addEvent(login,"click",Login);
      function Login(){
        var form =document.getElementById("form");
        if(username.value==""){
          alert("用户名不能为空!");
          this.value.focus();
          return false;
        }
        if(password.value==""){
          alert("密码不能为空!");
          this.value.focus();
          return false;
        }
        if(email.value==""){
          alert("email不能为空!");
          this.value.focus();
          return false;
        }
        else{
        var info =confirm("信息填写完整，确定注册吗?");
        if(info==true){
          window.open("http://www.eduasksz.com","_blank");
        }  
      }  
    }    
  }
}

以上是“javascript中表单正则应用的示例分析”这篇文章的所有内容，感谢各位的阅读！相信大家都有了一定的了解，希望分享的内容对大家有所帮助，如果还想学习更多知识，欢迎关注创新互联行业资讯频道！