uni.setTabBarItem设置背景渐变和文字颜色无效

首页设置tabbar背景颜色渐变和文字颜色设置后不起效果

onLoad() {  
    uni.setTabBarItem({  
          index: 2,  
          text: '快速入住',  
          iconPath: "static/image/icons/checkIn.png",  
          selectedIconPath: "static/image/icons/checkIn.png",  
          backgroundImage: 'linear-gradient(to top, #a80077, #66ff00)',  
          color: "#fff"  
        })  
  }