1、引入filesaver.js插件；
2、JS:
方法一：var file = new File(["欢迎访问 hangge.com"], "文件导出测试.txt", {type: "text/plain;charset=utf-8"});
saveAs(file);方法二：
var blob = new Blob(["欢迎访问 hangge.com"], {type: "text/plain;charset=utf-8"});
saveAs(blob, "文件导出测试.txt");