如何满足这个需求:将js的结果写入到文件。

教室里不能联网,不能安装其他的软件(php python就别想了),firefox浏览器。
我写了一个js小应用。可以将js产生的一些数据存入localStarage,
现在,我想将这个localStorage保存到u盘,可以怎么办?

繁花如伊
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HUX布斯

<html><head><meta charset="UTF-8"><title>Document</title></head><body><input type="button" id="btncli" value="click" /><script src="jquery-2.1.4.min.js"></script><script type="text/javascript">&nbsp; &nbsp; var click=0;&nbsp; &nbsp; $("#btncli").click(function(){&nbsp; &nbsp; &nbsp; &nbsp; localStorage.setItem('msg', 'hello javascript');&nbsp; &nbsp; &nbsp; &nbsp; var str = localStorage.getItem('msg');&nbsp; &nbsp; &nbsp; &nbsp;&nbsp;&nbsp; &nbsp; &nbsp; &nbsp; var blob = new Blob([str]);&nbsp; &nbsp; &nbsp; &nbsp; var a = document.createElement("a");&nbsp; &nbsp; &nbsp; &nbsp; a.href = window.URL.createObjectURL(blob);&nbsp; &nbsp; &nbsp; &nbsp; a.download = "a.txt";&nbsp; &nbsp; &nbsp; &nbsp; a.textContent = "下载";&nbsp; &nbsp; &nbsp; &nbsp; document.body.appendChild(a);&nbsp; &nbsp; });</script></body></html>
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JavaScript