validateFileUpload. validateFileUpload-es6.js用于文件上传时进行格式、大小等规则校验，成功与否都执行回调函数，采用ES6语法，不依赖其他库，可单独运行。

Problem

The full read on this project is a sign-in away — what it solves, who it serves, and where it sits in the market.

Audience

The full read on this project is a sign-in away — what it solves, who it serves, and where it sits in the market.

Market

The full read on this project is a sign-in away — what it solves, who it serves, and where it sits in the market.

Pricing

The full read on this project is a sign-in away — what it solves, who it serves, and where it sits in the market.