toJson method
Implementation
Map<String, dynamic> toJson() {
final Map<String, dynamic> data = new Map<String, dynamic>();
data['time'] = this.time;
data['open'] = this.open;
data['close'] = this.close;
data['high'] = this.high;
data['low'] = this.low;
data['vol'] = this.vol;
data['amount'] = this.amount;
data['ratio'] = this.ratio;
data['change'] = this.change;
return data;
}