JS drag the mouse to draw a box to implement the selection of the mouse, js Selection

JS drag the mouse to draw a box to implement the selection of the mouse, js Selection

This article describes how to drag and drop a box in JS to implement the selection of the mouse. Share it with you for your reference. The details are as follows:

A very practical JS technique. You can drag a mouse to draw a box and use it as a selection area. It can be used to draw a flowchart, design a sketch or something. It can also be used to crop and select an image when uploading an avatar, it is widely used in Avatar cropping. When you drag the mouse over the image and pull out a box, this box represents the selection function. Currently, it is a popular operation on the webpage. It mainly depends on JavaScript code.

Shows the running effect:

The Code is as follows:

<! DOCTYPE html PUBLIC "-// W3C // dtd xhtml 1.0 Strict // EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"> 
I hope this article will help you design javascript programs.