## if 1. 對某些條件進行判斷; ## 語法結構 語法: ``` if (condition) {...}; ``` 上下文: ``` server | location ``` 示例: ``` if($http_user_agent ~ Chrome){ rewrite /(.*)/chrome/$1 break; } ``` ## condition  ## 示例1 ``` location / { if ($remote_addr = "127.0.0.1") { //當本機訪問的時候會進入if代碼段 return 200 "訪問錯誤"; } } ``` 結果: ``` ? nginx curl website.com 訪問錯誤% ``` ## 示例2 ``` location / { if ($uri = "/images/") { rewrite (.*) /pics/ break; } } ```