func main() {
// 定义切片
var langs = []string{"Go", "Python", "Ruby", "Java"}
framworks := []string...%v\n", webFrameworks, webFrameworks, len(webFrameworks))
webFrameworks = append(webFrameworks, "Grails...%v", webFrameworks, webFrameworks, len(webFrameworks))
}
执行上述代码，输出结果如下：
[]string, [], 0
[]string, [Grails...")
fmt.Printf("%T, %v, %v\n", lans, lans, len(lans))
lans = append(lans, "Python", "Go", "Java...], 4
[]string, [Elixir Scala Ruby Groovy Python Go Java], 7
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