什麼是 E-a-t，為什麼它對 Seo 很重要？適合移動設備的商業網站

Error
SyntaxError: Unexpected token ÿ in JSON at position 0
    at JSON.parse (<anonymous>)
    at /root/rankerxmobiledoc/index.js:61:55
    at Layer.handle [as handle_request] (/root/rankerxmobiledoc/node_modules/express/lib/router/layer.js:95:5)
    at next (/root/rankerxmobiledoc/node_modules/express/lib/router/route.js:137:13)
    at Route.dispatch (/root/rankerxmobiledoc/node_modules/express/lib/router/route.js:112:3)
    at Layer.handle [as handle_request] (/root/rankerxmobiledoc/node_modules/express/lib/router/layer.js:95:5)
    at /root/rankerxmobiledoc/node_modules/express/lib/router/index.js:281:22
    at Function.process_params (/root/rankerxmobiledoc/node_modules/express/lib/router/index.js:335:12)
    at next (/root/rankerxmobiledoc/node_modules/express/lib/router/index.js:275:10)
    at /root/rankerxmobiledoc/node_modules/body-parser/lib/read.js:130:5