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Update particles.js #532

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Update particles.js #532

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Here, pJS_tag is the element obtained by getElementById. If tag_id is incorrect or there is no corresponding element on the page, pJS_tag will be null. Then, when trying to call the getElementsByClassName method, an error will be thrown.

To resolve this issue, :

  1. Ensure that tag_id is correct and that there is indeed an element with that ID on the page.
  2. Check if pJS_tag is null or undefined before calling getElementsByClassName.

@RJ2208-Wrq
Update particles.js
a0b3f05 
Here, `pJS_tag` is the element obtained by `getElementById`. If `tag_id` is incorrect or there is no corresponding element on the page, `pJS_tag` will be `null`. Then, when trying to call the `getElementsByClassName` method, an error will be thrown.

To resolve this issue,  :
1. Ensure that `tag_id` is correct and that there is indeed an element with that ID on the page.
2. Check if `pJS_tag` is `null` or `undefined` before calling `getElementsByClassName`.
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