JavaScript implements the feature of the Select All option box and the function of the mouse cursor in the drop-down box--javascript instance collection (beginner)

Source: Internet
Author: User

There are some forums where the selection box will appear in the background editor of the article.

1. Implement the option box select all and deselect all functions:

Code implementation:

<! DOCTYPE html>

 2. Mouse clicks the function of the drop-down box: The function of the delay timer is used here

Code implementation:

<! DOCTYPE html>

  

JavaScript implements the feature of the Select All option box and the function of the mouse cursor in the drop-down box--javascript instance collection (beginner)

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