如何从本地音频文件生成base64字符串

Question

如何从本地音频文件生成base64字符串？

我需要通过socket.io作为base 64 string

发送

我实际上使用angularjs

angular.module('starter.controllers', [])

  .controller('DashCtrl', function () {

    var handleFileSelect = function (evt) {
      var file = evt.target.files[0];
      var reader = new FileReader();

      // this is the path of the file that i will have to send to the server
      // /android_asset/www/sounds/button-1.mp3

      reader.onload = function (readerEvt) {
        var binaryString = readerEvt.target.result;
        document.getElementById("base64textarea").value = btoa(binaryString);
      };

      reader.readAsBinaryString(file);
    };
  });