打包后底部导航栏图标消失

'''tabBar" : {
"color" : "#999999",
"selectedColor" : "#007AFF",
"backgroundColor" : "#FFFFFF",
"borderStyle" : "black",
"list" : [
{
"pagePath" : "pages/child/index",
"text" : "首页",
"iconPath" : "static/home.png",
"selectedIconPath" : "static/home.png"
},
{
"pagePath" : "pages/child/profile",
"text" : "我的",
"iconPath" : "static/profile.png",
"selectedIconPath" : "static/profile.png"
}
]
}'''