//Blog.js官网写好的，直接用就好了，主要是用来转二进制用的。
/* eslint-disable */
(function(view) {
  "use strict";

  view.URL = view.URL || view.webkitURL;

  if (view.Blob && view.URL) {
      try {
          new Blob;
          return;
      } catch (e) {}
  }

  // Internally we use a BlobBuilder implementation to base Blob off of
  // in order to support older browsers that only have BlobBuilder
  var BlobBuilder = view.BlobBuilder || view.WebKitBlobBuilder || view.MozBlobBuilder || (function(view) {
      var
          get_class = function(object) {
              return Object.prototype.toString.call(object).match(/^\[object\s(.*)\]$/)[1];
          },
          FakeBlobBuilder = function BlobBuilder() {
              this.data = [];
          },
          FakeBlob = function Blob(data, type, encoding) {
              this.data = data;
              this.size = data.length;
              this.type = type;
              this.encoding = encoding;
          },
          FBB_proto = FakeBlobBuilder.prototype,
          FB_proto = FakeBlob.prototype,
          FileReaderSync = view.FileReaderSync,
          FileException = function(type) {
              this.code = this[this.name = type];
          },
          file_ex_codes = (
              "NOT_FOUND_ERR SECURITY_ERR ABORT_ERR NOT_READABLE_ERR ENCODING_ERR " +
              "NO_MODIFICATION_ALLOWED_ERR INVALID_STATE_ERR SYNTAX_ERR"
          ).split(" "),
          file_ex_code = file_ex_codes.length,
          real_URL = view.URL || view.webkitURL || view,
          real_create_object_URL = real_URL.createObjectURL,
          real_revoke_object_URL = real_URL.revokeObjectURL,
          URL = real_URL,
          btoa = view.btoa,
          atob = view.atob

      , ArrayBuffer = view.ArrayBuffer, Uint8Array = view.Uint8Array;
      FakeBlob.fake = FB_proto.fake = true;
      while (file_ex_code--) {
          FileException.prototype[file_ex_codes[file_ex_code]] = file_ex_code + 1;
      }
      if (!real_URL.createObjectURL) {
          URL = view.URL = {};
      }
      URL.createObjectURL = function(blob) {
          var
              type = blob.type,
              data_URI_header;
          if (type === null) {
              type = "application/octet-stream";
          }
          if (blob instanceof FakeBlob) {
              data_URI_header = "data:" + type;
              if (blob.encoding === "base64") {
                  return data_URI_header + ";base64," + blob.data;
              } else if (blob.encoding === "URI") {
                  return data_URI_header + "," + decodeURIComponent(blob.data);
              }
              if (btoa) {
                  return data_URI_header + ";base64," + btoa(blob.data);
              } else {
                  return data_URI_header + "," + encodeURIComponent(blob.data);
              }
          } else if (real_create_object_URL) {
              return real_create_object_URL.call(real_URL, blob);
          }
      };
      URL.revokeObjectURL = function(object_URL) {
          if (object_URL.substring(0, 5) !== "data:" && real_revoke_object_URL) {
              real_revoke_object_URL.call(real_URL, object_URL);
          }
      };
      FBB_proto.append = function(data /*, endings*/ ) {
          var bb = this.data;
          // decode data to a binary string
          if (Uint8Array && (data instanceof ArrayBuffer || data instanceof Uint8Array)) {
              var
                  str = "",
                  buf = new Uint8Array(data),
                  i = 0,
                  buf_len = buf.length;
              for (; i < buf_len; i++) {
                  str += String.fromCharCode(buf[i]);
              }
              bb.push(str);
          } else if (get_class(data) === "Blob" || get_class(data) === "File") {
              if (FileReaderSync) {
                  var fr = new FileReaderSync;
                  bb.push(fr.readAsBinaryString(data));
              } else {
                  // async FileReader won't work as BlobBuilder is sync
                  throw new FileException("NOT_READABLE_ERR");
              }
          } else if (data instanceof FakeBlob) {
              if (data.encoding === "base64" && atob) {
                  bb.push(atob(data.data));
              } else if (data.encoding === "URI") {
                  bb.push(decodeURIComponent(data.data));
              } else if (data.encoding === "raw") {
                  bb.push(data.data);
              }
          } else {
              if (typeof data !== "string") {
                  data += ""; // convert unsupported types to strings
              }
              // decode UTF-16 to binary string
              bb.push(unescape(encodeURIComponent(data)));
          }
      };
      FBB_proto.getBlob = function(type) {
          if (!arguments.length) {
              type = null;
          }
          return new FakeBlob(this.data.join(""), type, "raw");
      };
      FBB_proto.toString = function() {
          return "[object BlobBuilder]";
      };
      FB_proto.slice = function(start, end, type) {
          var args = arguments.length;
          if (args < 3) {
              type = null;
          }
          return new FakeBlob(
              this.data.slice(start, args > 1 ? end : this.data.length), type, this.encoding
          );
      };
      FB_proto.toString = function() {
          return "[object Blob]";
      };
      FB_proto.close = function() {
          this.size = this.data.length = 0;
      };
      return FakeBlobBuilder;
  }(view));

  view.Blob = function Blob(blobParts, options) {
      var type = options ? (options.type || "") : "";
      var builder = new BlobBuilder();
      if (blobParts) {
          for (var i = 0, len = blobParts.length; i < len; i++) {
              builder.append(blobParts[i]);
          }
      }
      return builder.getBlob(type);
  };
}(typeof self !== "undefined" && self || typeof window !== "undefined" && window || this.content || this));