利用jszip和filesaver插件实现在线压缩功能
利用js实现了在线压缩功能，思路如下：
1、利用input type=file标签，上传多个文件。
2、使用filereader，读取上传的文件到内存中。
3、使用jszip插件，压缩上传的文件
4、使用filesaver插件，将压缩的文件存回本地。
实现过程中遇到如下难点，列在下边，方便大家遇到类似问题，可以搜索到本文。
1、用input type=file上传文件后，取得的是files数组，每个file对象，仅仅包含文件信息，并不是文件本身。
2、想读取本地文件，需要使用filereader对象，由于io操作本身耗时，所以filereader被设计成异步读取。filereader本身无法直接读取files数组，使用for循环遍历数组，逐一读取file对象，最直接的想法是在每个for循环中new 一个filereader对象，分别读取。没有采用是因为对js的线程和内存模型不了解，无法对多线程施加有效的控制。比较希望实现同步读取，读取过程中，主线程挂起，等待文件逐个读完后，再继续后边的操作，但搜索下来，没找到同步读取插件，所以需要自己实现。
实现代码如下（chrome 73.0.3683.103 测试通过）：
在线压缩</tit</code></pre> </p>
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