错误信息：
[v1] [17:51:59] Cannot load gulp: Error: Error in module: .\gulpfile.js:
[v1] Error: Cannot find module 'D:\project\eyeshot\project\gulpfile.js'
[v1] at Function.Module._resolveFilename (module.js:476:15)
[v1] at Function.Module._load (module.js:424:25)
[v1] at Module.require (module.js:504:17)
[v1] at require (internal/module.js:20:19)
[v1] at D:\project\eyeshot\project\node_modules\@ionic\v1-toolkit\dist\lib\gulp.js:29:17
[v1] at next (native)
[v1] at D:\project\eyeshot\project\node_modules\@ionic\v1-toolkit\node_modules\tslib\tslib.js:107:75
[v1] at Object.__awaiter (D:\project\eyeshot\project\node_modules\@ionic\v1-toolkit\node_modules\tslib\tslib.js:103:16)
[v1] at loadGulp (D:\project\eyeshot\project\node_modules\@ionic\v1-toolkit\dist\lib\gulp.js:13:20)
[v1] at Object.<anonymous> (D:\project\eyeshot\project\node_modules\@ionic\v1-toolkit\dist\lib\gulp.js:47:32)
解决办法：
npm install --global gulp