[nginx] The difference between root and alias in nginx:

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The main difference between root and alias is that nginx如何解释location后面的urithis will cause the two to map requests to server files in different ways.
The processing result of root is: root路径＋location路径
The processing result of alias is: 使用alias路径替换location路径
alias是一个目录别名的定义，root则是最上层目录的定义. Another important difference is alias后面必须要用"/"结束that otherwise the file will not be found. . . And root is
optionalalias标签的目录块中不能使用rewrite的break