在sepFour這個項目里面，安裝element-ui時出現了這樣子的一個錯誤
F:\03 prc\prc\sepFour>npm i element-ui -S npm ERR! Unexpected end of JSON input while parsing near '...rma-spec-reporter":"0' npm ERR! A complete log of this run can be found in: npm ERR! e:\softwareEXP\node.js\node_cache\_logs\2018-09-12T06_13_21_597Z-debug.log
這時候有一個解決方案，就是執行下面的代碼后再重新執行一次安裝element-ui的命令：
npm cache clean --force
安裝成功會出現下面的提示，可以看到安裝的版本是+ element-ui@2.4.6：
Administrator@HTYYEML4JA3HA0P MINGW64 /f/03 prc/prc/noshery $ npm i element-ui -S npm WARN ajv-keywords@3.2.0 requires a peer of ajv@^6.0.0 but none is installed. You must install peer dependencies yourself. npm WARN optional SKIPPING OPTIONAL DEPENDENCY: fsevents@1.2.4 (node_modules\fsevents): npm WARN notsup SKIPPING OPTIONAL DEPENDENCY: Unsupported platform for fsevents@1.2.4: wanted {"os":"darwin","arch":"any"} (current: {"os":"win32","arch":"x64"}) + element-ui@2.4.6 added 6 packages from 6 contributors in 30.767s
如果再安裝不成功，可以試試加sudo提升權限進行-g全局安裝。