游戏失败时高亮重启按钮
//更改按钮颜色
ColorBlock cb = new ColorBlock();
cb.normalColor = Color.yellow;
cb.highlightedColor = Color.yellow;
cb.pressedColor = Color.yellow;
cb.disabledColor = Color.yellow;
cb.colorMultiplier = 1;
GameObject.Find("Canvas/ReStartButton").GetComponent<Button>().colors = cb;
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