How to modify th in javascript

How to modify th in JavaScript: 1. Create an HTML sample file; 2. Add a script tag; 3. Pass "$(document).read(function(){$('th').html( '...')})" method can modify the content of th.

The operating environment of this article: Windows 7 system, javascript version 1.8.5, DELL G3 computer

How to modify th in javascript?

For example:

js gets the th object and changes its content

如：
我是内容

The method is as follows:

Recommended learning: "javascript video tutorial"

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