在app.json设置tab时，iphone6/7 plus出现选中时，有背景颜色

“tabBar”: {

“color”: “#ddd”,

“selectedColor”: “#000”,

“backgroundColor”: “#fff”,

“list”: [

{

“pagePath”: “pages/index/index”,

“text”: “首页1”,

“iconPath”: “images/index1.png”,

“selectedIconPath”: “images/index2.png”

},

{

“pagePath”: “pages/index1/index1”,

“text”: “首页2”,

“iconPath”: “images/index3.png”,

“selectedIconPath”: “images/index4.png”

},

{

“pagePath”: “pages/index2/index2”,

“text”: “首页3”,

“iconPath”: “images/index5.png”,

“selectedIconPath”: “images/index6.png”

}

]

}