開發web api或web專案，修改原始碼後，無需手動重啟即可檢視效果，使用air即可實現。

安裝air：go get -v -u github.com/cosmtrek/air（或下載所有原始碼後，go build，得到air.exe，拷貝到$goroot/bin目錄）

在專案目錄下，建立.air.config檔案，修改[build]中的cmd配置，設定為goland編譯程式的命令列命令：

cmd = "go build -o ./tmp/xxx-demo.exe ./main.go"

最終配置檔案如下：

# Config file for [Air](https://github.com/cosmtrek/air) in TOML format
 
# Working directory
# . or absolute path,please note that the directories following must be under root.
root = "."
tmp_dir = "tmp"
 
[build]
# Just plain old shell command. You could use `make` as well.
cmd = "go build -o ./tmp/xxx-demo.exe ./main.go"
# Binary file yields from `cmd`.
bin = "tmp/xxx-demo.exe"
# Customize binary.
full_bin = "APP_ENV=dev APP_USER=air ./tmp/main"
# Watch these filename extensions.
include_ext = ["go","tpl","tmpl","html"]
# Ignore these filename extensions or directories.
exclude_dir = ["assets","tmp","vendor","frontend/node_modules"]
# Watch these directories if you specified.
include_dir = []
# Exclude files.
exclude_file = []
# It's not necessary to trigger build each time file changes if it's too frequent.
delay = 1000 # ms
# Stop to run old binary when build errors occur.
stop_on_error = true
# This log file places in your tmp_dir.
log = "air_errors.log"
 
[log]
# Show log time
time = false
 
[color]
# Customize each part's color. If no color found,use the raw app log.
main = "magenta"
watcher = "cyan"
build = "yellow"
runner = "green"
 
[misc]
# Delete tmp directory on exit
clean_on_exit = true

goland中開啟專案，在Terminal中執行air命令，即可自動監控專案程式碼修改，自動熱啟動服務，方便開發除錯。

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