验证用户注册信息是否合法_PHP
关键函数
通过JavaScript对用户注册信息的合法性进行验证时,经常需要对数值型数据进行检验。
JavaScript可以应用isNaN()函数实现上述功能,下面对该函数进行讲解。
isNaN()函数
用于判断该函数的参数是否为数值型数据,是返回False,否则返回True。
语法
bool isNaN(var)
参数var为要进行判断的数据。
功能实现
用户填写完注册信息后,为了保证这些信息的合法性,还应该对这些信息进行验证。对注册信息的合法性进行验证既可以应用PHP代码实现,也可以应用JavaScript实现。开发人员可以根据实际情况进行选取,如果担心客户端浏览器对JavaScript进行了限制,则可以采用PHP代码实现,但使用这种方法对注册信息进行验证是在服务器中进行的,所以会浪费大量的服务器资源。而应用JavaScript脚本对用户的注册信息进行验证,是客户端浏览器实现的,所以会在很大程度上节省服务器资源。本站对用户注册信息的验证通过JavaScript实现。在编写用户注册信息验证模块时,将实现用户注册信息验证的代码封装到自定义函数chkinput login()中,并在表单《form》标记的onSubmit事件中对该函数进行调用,Chkinput login()函数的代码如下。
以下为
以下为include_once("top.php"); 验证用户注册信息是否合法的运行结果如下图所示。 图验证用户的注册信息是否合法的运行结果 |

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