The name of this plug-in is elevatedzoom. The website address is http://www.elevateweb.co.uk/image-zoom. The project homepage on github is https://github.com/elevateweb/elevatezoom. It is recommended to download it from github. This website The speed is relatively fast.
To achieve this effect, you need to prepare two pictures, one small and one large for display when the mouse passes over it. Then we only need to add the data-zoom-image attribute to the img tag, whose value is the address of the large image, and finally select the image in javascript and call elevateZoom().
An example is given below (this example is included in the code downloaded from github):