当我们不需要它们的所有功能时，为什么要下载整个JavaScript框架？我们能建议什么？ （JavaScript的）

I like Google Web Tookit API approach. It use Java language behind the scenes that compiles ONLY JavaScript code WHOSE TARGET BROWSER NEEDS. It happens some developers would like to use that feature in pure JavaScript language. I like Google Web Tookit API approach. It use J