安装完成,启动页面时报错

chenshiyangdeMacBook-Pro:app chenshiyang$ npm run dev:h5

> app@1.0.0 dev:h5 /Users/chenshiyang/Desktop/project/taro/app

> npm run build:h5 -- --watch

> app@1.0.0 build:h5 /Users/chenshiyang/Desktop/project/taro/app

> taro build --type h5 "--watch"

? Taro v1.2.0

开始编译项目 app

创建  发现文件  src/app.js

创建  发现文件  src/app.less

创建  发现文件  src/index.html

创建  发现文件  src/pages/index/index.js

创建  发现文件  src/pages/index/index.less

缺少npm包@tarojs/webpack-runner，开始安装...

Cannot download "https://r.cnpmjs.org/node-sass//v4.11.0/darwin-x64-57_binding.node": 

HTTP error 404 Not Found

Hint: If github.com is not accessible in your location

      try setting a proxy via HTTP_PROXY, e.g. 

      export HTTP_PROXY=http://example.com:1234

or configure npm proxy via

      npm config set proxy http://example.com:8080

gyp info it worked if it ends with ok

gyp verb cli [ '/usr/local/bin/node',

gyp verb cli   '/Users/chenshiyang/Desktop/project/taro/app/node_modules/node-gyp/bin/node-gyp.js',

gyp verb cli   'rebuild',

gyp verb cli   '--verbose',

gyp verb cli   '--libsass_ext=',

gyp verb cli   '--libsass_cflags=',

gyp verb cli   '--libsass_ldflags=',

gyp verb cli   '--libsass_library=' ]

gyp info using node-gyp@3.8.0

gyp info using node@8.12.0 | darwin | x64