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Typescript | 箭頭函式返回值

/*
 * @Author: AK-12 
 * @Date: 2018-11-01 20:07:29 
 * @Last Modified by: AK-12
 * @Last Modified time: 2018-11-01 22:00:41
 */
import IBlock from './IBlock'

export default class Block implements IBlock {
  private sprite: cc.Sprite
  constructor(sprite: cc.Sprite) {
    this.sprite = sprite
  }

  public goLeft = (): void => {
    this.sprite.node.runAction(cc.moveBy(1, cc.v2(-100, 0)))
  }

  public goRight = (): void => {
    this.sprite.node.runAction(cc.moveBy(1, cc.v2(100, 0)))
  }

  public goUp = (): void => {
    this.sprite.node.runAction(cc.moveBy(1, cc.v2(0, 100)))
  }

  public goDown = (): void => {
    this.sprite.node.runAction(cc.moveBy(1, cc.v2(0, -100)))
  }
}