How to realize the function of attachment Preview in JavaScript

This article mainly introduces "how to achieve attachment preview function in JavaScript". In daily operation, I believe many people have doubts about how to achieve attachment preview function in JavaScript. Xiaobian consulted all kinds of materials and sorted out simple and easy-to-use methods of operation. I hope it will be helpful for you to answer the question of "how to achieve attachment preview function in JavaScript". Next, please follow the editor to study!

One is the js version, and the other is the jquery version, which is the js version here. The jquery version is only introduced in a slightly different way.

1. Introduction of plug-ins (uploaded)

two。 Write the preview page alive

Var attach_path='${param.attach_path}'; var attach_name= decodeURI ('${param.attach_name}'); var attachPath= new Array (); attachName=attach_name.split (","); var attachPath2= new Array (); attachPath2=attach_path.split (","); for