把字符串写入文件，最常用的功能
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package main
import (
"fmt"
"io"
"os"
)
func main() {
filename := "test.txt"
file, err := os.Create(filename)
if err != nil {
fmt.Println(err)
}
fmt.Println(" Write to file : " + filename)
n, err := io.WriteString(file, " Hello World ! 你好")
if err != nil {
fmt.Println(n, err)
}
file.Close()
}
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