JS实现的简单表单验证功能完整实例
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2021-01-19
16:13:49
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JS实现的简单表单验证功能完整实例实现的简单表单验证功能完整实例
本文实例讲述了JS实现的简单表单验证功能。分享给大家供大家参考，具体如下：
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>www.jb51.net 表单验证</title>
<style type="text/css">
<!--
body,td,th {
font-size: 12px;
color: #000000;
}
body {
background-color: #CCCCCC;
margin-left: 0px;
margin-top: 0px;
}
a {
font-size: 12px;
color: #666600;
}
a:link {
text-decoration: none;
}
a:visited {
text-decoration: none;
color: #000099;
}
a:hover {
text-decoration: underline;
color: #6633FF;
}
a:active {
text-decoration: none;
color: #00FF00;
}
-->
</style>
<script type="text/javascript">
function checkusername()
{
var myform = document.getElementById("form1");
var username = myform.username.value.length;
if(username < 1||username>12)
{
errusername.innerHTML = "<font color='red'>用户名不符合要求</font>";
return false;
}else{
errusername.innerHTML = "<font color='green'>用户名符合要求</font>";
return true;
}
}
function checkage()
{
var myform = document.getElementById("form1");
var age = myform.age.value;
if(age != parseInt(age))
{
errage.innerHTML = "<font color='red'>年龄不符合要求</font>";
return false;
}else{
errage.innerHTML = "<font color='green'>年龄符合要求</font>";
return true;
}
}
function checkemail()
{
var myform = document.getElementById("form1");
var mail=/^[A-Za-z0-9_-]+@[a-zA-Z0-9_-]+(\.[a-zA-Z0-9_-]+)+$/;
if(!mail.test(myform.email.value))
{
erremail.innerHTML = "<font color='red'>email不符合要求</font>";
return false;
}else{
erremail.innerHTML = "<font color='green'>email符合要求</font>";
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