<form class="newsletter">
 <input type="email" value="" placeholder="Enter your email address" />
 <input type="submit" value="OK" />
</form>   

$( function( $, window, document, undefined )
{
 'use strict';
 
 var form  = '.newsletter',
  className = 'newsletter--active',
  email  = 'input[type="email"]';
 
 $( form ).each( function()
 {
  var $form = $( this ),
   $email = $form.find( email ),
   val  = '';
 
  $email.on( 'keyup.addClassWhenEmail', function()
  {
   val = $email.val();
   $form.toggleClass( className, val != '' && /^([\w-\.]+@([\w-]+\.)+[\w-]{2,12})"color: #800000">IE6以上的浏览器

如果你想关闭这项功能，可以通过关闭名称空间addClassWhenEmail来实现。




$( '.newsletter input[type="email"]' ).off( '.addClassWhenEmail' );     



不使用jQuery，纯javascript的做法：




;( function( window, document, undefined )
{
 'use strict';
 
 var form  = '.newsletter',
  className = 'newsletter--active',
  email  = 'input[type="email"]',
 
  addEventListener = function( element, event, handler )
  {
   element.addEventListener "htmlcode">

var form  = '.newsletter',   // form selector
className = 'newsletter--active',  // class name for form when correct email is entered
email  = 'input[type="email"]', // email input field selector   


 CSS代码

js代码用来切换样式，真正显示于隐藏则通过css来实现：




.newsletter:not( .newsletter--active ) input[type='submit']
{
 display: none;
} 


以上就是为大家分享的jquery验证邮箱格式并显示提交按钮的方法，希望对大家的学习有所帮助。