设置的tabbar颜色不显示呢

{

"pages": [

"pages/index/index",

"pages/logs/logs"

],

"window": {

"navigationBarTitleText": "演示"

},

"tabBar": {

"list": [

{

"pagePath": "pages/index/index",

"text": "首页",

"color": "#8B008B"

},

{

"pagePath": "pages/logs/logs",

"text": "日志",

"backgroundColor": "#8B008B"

}

]

}

}