Web page undefined means that there is an unknown error on the page. The undefined error is usually caused when the definition is incorrect or the conversion is incorrect when developing the website, or the definition cannot be found. This error will prompt undefined. .
The operating environment of this article: Windows 7 system, Dell G3 computer.
Undefined refers to an unknown error on the page. The undefined error is usually caused when the definition or conversion is incorrect when developing the website, or the definition cannot be found.
undefined is a special value usually used to indicate that a variable has not yet been assigned a value. A reference to an undefined value returns the special value. In fact, most computer languages have only one value that represents "none", such as NULL in C language, null in Java language, None in Python language, and nil in Ruby language.
Generally, there are only two aspects of undefined problems, namely website server and browser local problems. It is recommended to take a look at the page source code. If the source code is also undefined, it means that the page is originally like this. This is a website server problem.
Extended information
The correct solution to undefined appears on the webpage:
1. Press "F5" on the keyboard and refresh it. If the "undefined" error message still appears on this page, then the browser is suspended or the program crashes. Let's copy the Baidu URL of this post bar;
2. Close it In the current browser, reopen the browser, paste the Baidu URL you just copied from this Tieba and visit it. The problem is that Baidu has received the sign-in command, but the feedback to the web page process was interrupted, so our page has an "undefined" error. This It's the browser's responsibility.
For more related articles, please visit theFAQcolumn!
The above is the detailed content of What does web page undefined mean?. For more information, please follow other related articles on the PHP Chinese website!