摘要：
/usr/bin/envnode'usestrict'；varcrossEnv=要求；交叉环境；将把node_模块/bin命令添加到环境变量中，例如：“start”：“cross-envESLINT=nonePORT=3001NO_PROXY=trueloadhoddev”。跨环境函数解决了跨平台环境变量的问题。。
该命令是在node_modules的bin目录下，类似的脚本有cross-env和cross-env-shell,在cross-env脚本中的内容如下:
#!/usr/bin/env node
'use strict';
var crossEnv = require('..');
crossEnv(process.argv.slice(2));
会把node_modules/bin的命令添加到环境变量中，比如:
"start": "cross-env ESLINT=none PORT=3001 NO_PROXY=true roadhog dev",
而cross-env的功能解决跨平台的环境变量的问题。。
cross-env makes it so you can have a single command without worrying about setting or using the environment variable properly for the platform. Just set it like you would if it's running on a POSIX system, and cross-env will take care of setting it properly.