先上效果图：
表单的基础内容就是昵称判断、手机号判断、邮箱判断、身份证号码判断，这里是用到正则验证检验格式。
页面的表单写法就是一个form的提交。输入框用input来实现，输入内容用value来获取。每个输入框用唯一的ID名字来标记：
<body>
<div class="content">
<div class="title">用户注册</div>
<form onsubmit="return false">
<div><label><span>*</span>昵称：</label><input onfocus="clearErr()" id="name" type="text" placeholder="只能包含中文、英文、数字和下划线"></div>
<div><label><span>*</span>手机：</label><input onfocus="clearErr()" id="phone" type="text" placeholder=""></div>
<div><label>邮箱：</label><input onfocus="clearErr()" id="email" type="text"></div>
<div><label>身份证号：</label><input onfocus="clearErr()" id="cardCode" type="text"></div>
<div><label>毕业学校：</label><input onfocus="clearErr()" id="school" type="text"></div>
<div><button id="registerBtn" type="submit">注册</button></div>
<div id="errContent"></div>
</form>
</div>
</body>
通过JS来实现输入验证，和正则验证：
<script>
window.onload = function(){
var oRegisterBtn = document.getElementById('registerBtn');
var oName = document.getElementById('name');
var oPhone = document.getElementById('phone');
var oEmail = document.getElementById('email');
var oCardCode = document.getElementById('cardCode');
var oschool = document.getElementById('school');
var oErrContent = document.getElementById('errContent');
oRegisterBtn.onclick = function(){
var doRegister = true;
var errStr = "";
if(!oName.value){
errStr += "用户名不能为空</br>";
doRegister = false;
}else if(/[^\u4e00-\u9fa5\w]/.test(oName.value)){
errStr += "用户名格式不对" +"</br>";
doRegister = false;
}
if(!oPhone.value){
errStr += "手机号不能为空</br>";
doRegister = false;
}else if(!/^1[3|4|5|8][0-9]\d{4,8}$/.test(oPhone.value)){
errStr += "手机号格式不对</br>";
doRegister = false;
}
if(oEmail.value && !/^\w+@[a-z0-9]+(\.[a-z]+){1,3}$/.test(oEmail.value)){
errStr += "邮箱格式不对</br>";
doRegister = false;
}
if(oCardCode.value && !/[1-9]\d{14}|[1-9]\d{17}|[1-9]\d{16}x/.test(oCardCode.value)){
errStr += "身份证号式不对</br>";
doRegister = false;
}
if(doRegister){
//此处写相应的ajax提交
alert("您的资料已提交...");
}else{
oErrContent.innerHTML = errStr;
}
}
}
function clearErr(){
document.getElementById('errContent').innerHTML = "";
}
</script>
样式内容也简单贴上吧：
<style>
*{
margin:0;
padding:0;
}
.content{
width:800px;
margin:50px auto;
}
.title{
font-size:18px;
font-weight:bold;
padding-left:340px;
margin-bottom:30px;
}
input{
border:1px solid #a9a9a9;
height:34px;
line-height:34px;
width:550px;
margin-bottom:20px;
padding-left:5px;
}
label{
width:120px;
text-align:right;
display:inline-block;
}
#registerBtn{
background:#3498db;
color:#fff;
font-size:14px;
text-align:center;
width:100px;
line-height:34px;
border:none 0;
cursor:pointer;
margin:20px 20px 0 0;
margin-left:120px;
}
label span{
color:red;
}
#errContent{
padding:20px 0 0 30px;
text-align:center;
}
</style>
表单验证用到的地方多，也有很多人写过，所以我这里只是用更简洁的方法来实现。同理可以推陈出新很多内容