Unsupported URL Type: npm:string-width@^4.2.0

weex preview报错：
× Install fail! Error: Unsupported URL Type: npm:string-width@^4.2.0
Error: Unsupported URL Type: npm:string-width@^4.2.0
at parseUrl (C:\Users\h\.wx\core\node_modules\_npm-package-arg@4.2.1@npm-package-arg\npa.js:186:13)
at npa (C:\Users\h\.wx\core\node_modules\_npm-package-arg@4.2.1@npm-package-arg\npa.js:79:12)
at _install (C:\Users\h\.wx\core\node_modules\_npminstall@3.28.1@npminstall\lib\install.js:62:11)
at _install.next ()
at onFulfilled (C:\Users\h\.wx\core\node_modules\_co@4.6.0@co\index.js:65:19)
at C:\Users\h\.wx\core\node_modules\_co@4.6.0@co\index.js:54:5
at new Promise ()
at co (C:\Users\h\.wx\core\node_modules\_co@4.6.0@co\index.js:50:10)
at toPromise (C:\Users\h\.wx\core\node_modules\_co@4.6.0@co\index.js:118:63)
at next (C:\Users\h\.wx\core\node_modules\_co@4.6.0@co\index.js:99:29)

Reproduce the Weex preview install on the reported Windows setup and inspect npm-package-arg/npa.js and npminstall/lib/install.js at the reported stack frames. Determine why npm:string-width@^4.2.0 is rejected and verify the fix by confirming that preview installation completes without this error.

Written by the indexing model from the issue text.