{
  "id": "/", "name": "Echo", "short_name": "Echo", "lang": "zh-CN",
  "start_url": "/", "scope": "/", "display": "standalone",
  "background_color": "#ffffff", "theme_color": "#ffffff",
  "icons": [{"src":"/echo-face.png","sizes":"1254x1254","type":"image/png","purpose":"any"}]
}