Javascript code _ javascript skills

This article introduces the specific code for js Implementation of stretching and dragging iframe. If you need it, you can refer to the iframe tree directory on the left and iframe on the index page on the right. Drag the mouse to control the width and height of the two iframe simultaneously.
We look forward to some improvements.
Operation Method: place the cursor in the middle of two iframe parameters, which can be dragged horizontally or vertically (height control)
Disadvantage: the size of the CSDN page is changed only after the mouse is opened, which does not occupy CPU resources. This is a real-time size change, so the speed is too slow. I hope someone will change it. I don't want to do it anymore. It's useless.
Tip: The secret of dragging is in the filter: alpha (opacity = 0) sentence.

The Code is as follows: