webpack安装出现Unexpected end of input？

Question

D:\phpStudy1\WWW\myexpress\web-pack>npm i -D webpack

npm ERR! Unexpected end of input at 1:19108

npm ERR! 85ee90a76dbf346","tarball":"https://registry.npmjs.org/ajv/-/ajv-0.4.

npm ERR!                                                                      ^

npm ERR! A complete log of this run can be found in:

npm ERR!     C:\Users\Administrator\AppData\Roaming\npm-cache\_logs\2017-09-22T0

1_39_32_917Z-debug.log