code: function( key, blob, filename ) {
                  var me = this,
                      opts = me.options;
      
                  if ( me.getRuid() ) {
                      me.disconnectRuntime();
                  }
      
                  // 连接到blob归属的同一个runtime.
                  me.connectRuntime( blob.ruid, function() {
                      me.exec('init');
                  });
      
                  me._blob = blob;
                  opts.fileVar = key || opts.fileVar;
                  opts.filename = filename || opts.filename;
              }
docs: 添加Blob, 只能添加一次，最后一次有效。