这篇文章主要介绍JavaScript实现表单验证的方法，文中介绍的非常详细，具有一定的参考价值，感兴趣的小伙伴们一定要看完！

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在JavaScript中我们可以在数据被送往服务器前对 HTML 表单中的这些输入数据进行验证。客户端表单验证通常使用javascript完成，对于大多数用户来说，JavaScript表单验证将节省大量时间，但是如果用户关闭了JavaScript，则仍需要仔细检查服务器上的数据。通常有JavaScript检查的表单数据有：

（1）用户是否已填写表单中的必填项目

（2）用户输入的邮件地址是否合法

（3）用户是否已输入正确格式的密码

（4）用户是否在数据域 中输入了文本

接下来将通过实际案例告诉大家JavaScript中表单验证如何使用

html代码

 

    

用户名：
    
   
 

 

     

密码 ：
      
      

验证用户名和密码的输入是否出错

	    基本
        文件
        流程
        错误
        SQL
        调试
    

		    

    

	
请求信息 : 2026-05-18 07:33:16 HTTP/1.1 GET : /article/diioig.html
运行时间 : 1.3668s ( Load:0.0062s Init:0.7255s Exec:0.6260s Template:0.0091s )
吞吐率 : 0.73req/s
内存开销 : 2,224.34 kb
查询信息 : 12 queries 5 writes 
文件加载 : 36
缓存信息 : 0 gets 0 writes 
配置加载 : 130
会话信息 : SESSION_ID=2qnrnpsjehljdji0toje63n0t0
    
    
        

    

	
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[ app_init ] --START--
Run Behavior\BuildLiteBehavior [ RunTime:0.000005s ]
[ app_init ] --END-- [ RunTime:0.000028s ]
[ app_begin ] --START--
Run Behavior\ReadHtmlCacheBehavior [ RunTime:0.000270s ]
[ app_begin ] --END-- [ RunTime:0.000289s ]
[ view_parse ] --START--
[ template_filter ] --START--
Run Behavior\ContentReplaceBehavior [ RunTime:0.000051s ]
[ template_filter ] --END-- [ RunTime:0.000070s ]
Run Behavior\ParseTemplateBehavior [ RunTime:0.006247s ]
[ view_parse ] --END-- [ RunTime:0.006273s ]
[ view_filter ] --START--
Run Behavior\WriteHtmlCacheBehavior [ RunTime:0.000156s ]
[ view_filter ] --END-- [ RunTime:0.000170s ]
[ app_end ] --START--
    
    
        

    

	
1064:You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ') LIMIT 1' at line 1
 [ SQL语句 ] : SELECT `id`,`pid`,`navname` FROM `cx_nav` WHERE ( id= ) LIMIT 1  
1064:You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ') LIMIT 1' at line 1
 [ SQL语句 ] : SELECT `id`,`navname` FROM `cx_nav` WHERE ( id= ) LIMIT 1  
1064:You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ')' at line 1
 [ SQL语句 ] : SELECT `id`,`navname` FROM `cx_nav` WHERE ( pid= ) 
[8] Undefined index: pid /www/wwwroot/tsicrk.com/App/Home/Controller/ArticleController.class.php 第 47 行.
[8] Undefined index: db_host /www/wwwroot/tsicrk.com/ThinkPHP/Library/Think/Db.class.php 第 120 行.
[8] Undefined index: db_port /www/wwwroot/tsicrk.com/ThinkPHP/Library/Think/Db.class.php 第 121 行.
[8] Undefined index: db_name /www/wwwroot/tsicrk.com/ThinkPHP/Library/Think/Db.class.php 第 122 行.
    
    
        

    

	    
    
        

    

	    
    
    



1.3668s