Javascript _ javascript tips

This article mainly introduces how to draw a box by dragging the mouse in JS to implement the selection of the mouse. it involves javascript mouse events and related techniques of page element styles, and has some reference value, for more information, see the examples in this article. The following describes how to drag and draw a box with the JS mouse 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:

Mouse drag animation rectangle