How to determine if id exists in javascript

Javascript method to determine whether the id exists: 1. Create an HTML sample file; 2. Add a script tag; 3. Use the "function exist(id){...}" method to determine whether the id exists. .

The operating environment of this article: windows7 system, javascript version 1.8.5, Dell G3 computer.

How does JavaScript determine whether the id exists?

js method to determine whether id exists

The code is as follows:

      
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