微信小程序顶部透明

{
    "pages": [
        "pages/index/index"
    ],
    "window": {
        "backgroundTextStyle": "light",
        "navigationBarBackgroundColor": "#fff",
        "navigationBarTitleText": "Weixin",
        "navigationBarTextStyle": "black",
        "navigationStyle":"custom"
    },
    "style": "v2",
    "sitemapLocation": "sitemap.json"
}