解决方案
在安装express时增加generator参数：
npm install -g express-generator
原因解释
为什么要加上generator呢？
原先的express带cli, 现在把cli拆成了单独的express-generator包. 原先的express运行生成的项目是node app.js, 因为httpserver相关代码都在app.js里, 现在这部分代码移到了项目目录的bin/www下面, app.js只保留实现app的逻辑代码, 你需要去运行那个bin/www。 只是很单纯的细化应用和包依赖的版本变更。
此外，express命令行在AppData\Roaming\npm下面，默认AppData\Roaming\npm在环境变量path里。
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