What causes a JavaScript error?

General Discussions
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What are the reasons of getting JavaScript errors?

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A JavaScript error occurs when there is a problem with the code in a web page. The errors happen as the program tries to interpret the code and, at some point, it just can’t: it’s an error.

There are two ways that a JavaScript error may occur:

  1. A syntax error - this is a mistake in the syntax of the code. For example, you might be trying to use “=” instead of “==”.

  2. A runtime error - this occurs when there are mistakes in the way that you’ve instructed the computer to execute the code. For example, if you don’t tell your computer to close a window when you’re done with it, it won’t know what to do.

Read more: Common Causes of JavaScript Errors | HTMLGoodies.com