unity 更换image的Source

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//声明一张image

public Image Bg;

//声明更换的图片序号

int ImageNum=1；

private string Res_BGPath = "Image/BackGround/"; //背景路径

//更换路径 

Bg.GetComponent<Image>().sprite = Resources.Load(Res_BGPath + ImageNum, typeof(Sprite)) as Sprite;