Example sharing of JavaScript implementation of registration page form verification

The following editor will bring you an example of using JavaScript to complete the form verification on the registration page. The editor thinks it’s pretty good, so I’ll share it with you now and give it as a reference. Let’s follow the editor and take a look

1. Step analysis

The first step: Determine the event (onsubmit) and provide It binds a function

Step 2: Write this function (get the data input by the user )

Step 3: To the user Judge the entered data

Step 4: The data is legal (allow the form to be submitted)

Step 5: The data is illegal (give an error message and do not allow the form to be submitted)

Question: How to control form submission?

About the event onsubmit: Generally used for form submission, then a return value needs to be given when defining the function.

onsubmit = return checkForm()

2. Complete the registration page form verification

      
  
  
 
  
 
 
  
 
  
 
 登录 注册 购物车 
 
 
 
 
  
 
 首页 手机数码 电脑办公 鞋靴箱包 家用电器 
 
  
 
  
 
 
 
 会员注册 USER REGISTER 
 
 
 
用户名
 
  
 
 
 
密码
 
  
 
 
 
确认密码
 
  
 
 
 
E-mail
 
  
 
 
 
姓名
 
  
 
 
 
性别
 
 男 女 
 
 
 
出生日期
 
  
 
 
 
验证码
 
   
 
 
 
  
 
 
 
 
 
  
 
  
 
  
 
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Use regular expressions in the verification and confirmation part of the password (no need to remember, look for documents when needed)

Regular expression.test (verification object) is true if it meets the conditions, if it is false, it is incompatible.

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