cnpm安裝過程中提示optional install error: Package require os(darwin) not compatible with your platform(win32)解決方法：
輸入命令行：cnpm rebuild node-sass
#不放心可以重新安裝下
cnpm install
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vue 報錯：Module build failed: Error: Cannot find module 'node-sass'
輸入命令：cnpm install node-sass@latest