Already removed in hexo-fs plugin. As this function is never called, the Hexo functions would not be affected.

npm install hexo-fs --save
but on my pc,This command is valid only once.

@CTBUmyq what do you mean valid? Any error trace output?

更新了hexo-fs插件，但是依旧报错

The hexo specified hexo-fs version as ^0.1.5, however, the hexo-fs fix is landed on 0.2.0, according to semver. We need to update hexo-fs version to ^0.2.0 and release 3.3.8.

通过npm install hexo-fs --save解决不了的，是因为在hexo-deployer-git中还有一个node_modules/hexo-fs目录，但是hexo-deployer-git官方Github中是没有这个目录的，可能是因为npm源没有更新，所以hexo-deployer-git中有一个旧版本的hexo-fs，注释掉E:\github\blog\node_modules\hexo-deployer-git\node_modules\hexo-fs\lib\fs.js中第718行exports.SyncWriteStream = fs.SyncWriteStream;就行了，或者手动更新hexo-deployer-git。
详情请见：http://rangerzhou.top/2017/07/27/Hexo%E5%8D%9A%E5%AE%A2%E6%B3%A8%E6%84%8F%E4%BA%8B%E9%A1%B9/

@rangerzhou Good catch! Once we release a new version of hexo-deployer-git, you can solve this via npm upgrade

@NoahDragon I've updated the hexo-deployer-git and hexo-deployer-heroku to use hexo-fs 0.2.x, could you publish these packages? Thank you.

@JLHwung Got it, will publish them to NPM later today.

@NoahDragon Thank you very much.

FYI, the following packages may contain the old version of Hexo-fs have been updated.

hexo-deployer-git 0.3.1
hexo-math 3.0.3
hexo-renderer-ejs 0.3.1
hexo-deployer-openshift 0.1.2
hexo-server 0.2.2
hexo-deployer-heroku 0.1.2

I have also met this warning message. But npm update can not update hexo-deployer-git, hexo-renderer-ejs and hexo-server. I have to uninstall the three packages using npm uninstall and reinstall them using npm install <PACKAGE_NAME> --save.