```
然后将 template 文本从代码中移除
main.go
```go
package main
import (
"html/template"
"net/http"
)
// User struct
type User struct {
Username string
}
func main() {
http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
user := User{Username: "bonfy"}
tpl, _ := template.ParseFiles("templates/index.html")
tpl.Execute(w, &user)
})
http.ListenAndServe(":8888", nil)
}
```
然后运行，在浏览器中打开，结果是与刚才一样的，不过代码的组织结构却更清晰了。
> 本小节 [Diff](https://github.com/bonfy/go-mega-code/commit/cca162aa6510f6d8bf96cb21ef8aed5ea0a1a1a1)
## 模板的常用操作
### 条件语句
在 index.html 中加入条件语句
templates/index.html
```markup
{{if .Title}}
{{.Title}} - blog
{{else}}
Welcome to blog!
{{end}}
Hello, {{.User.Username}}!
```
由于 User 没有 Title字段，所以我们引入新的 IndexViewModel 来具体处理所有与View对应的Model
main.go
```go
package main
import (
"html/template"
"net/http"
)
// User struct
type User struct {
Username string
}
// IndexViewModel struct
type IndexViewModel struct {
Title string
User User
}
func main() {
http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
user := User{Username: "bonfy"}
v := IndexViewModel{Title: "Homepage", User: user}
tpl, _ := template.ParseFiles("templates/index.html")
tpl.Execute(w, &v)
})
http.ListenAndServe(":8888", nil)
}
```
> 本小节 [Diff](https://github.com/bonfy/go-mega-code/commit/9df5fb2f1f7d400513e3877aad0704a5e69366ac)
### 循环
在 index.html 中加入循环
```markup
{{if .Title}}
{{.Title}} - blog
{{else}}
Welcome to blog!
{{end}}
Hello, {{.User.Username}}!
{{range .Posts}}
{{ .User.Username }} says: {{ .Body }}
{{end}}
```
在 main.go 的 IndexViewModel 中加入 Post
```go
package main
import (
"html/template"
"net/http"
)
// User struct
type User struct {
Username string
}
// Post struct
type Post struct {
User User
Body string
}
// IndexViewModel struct
type IndexViewModel struct {
Title string
User User
Posts []Post
}
func main() {
http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
u1 := User{Username: "bonfy"}
u2 := User{Username: "rene"}
posts := []Post{
Post{User: u1, Body: "Beautiful day in Portland!"},
Post{User: u2, Body: "The Avengers movie was so cool!"},
}
v := IndexViewModel{Title: "Homepage", User: u1, Posts: posts}
tpl, _ := template.ParseFiles("templates/index.html")
tpl.Execute(w, &v)
})
http.ListenAndServe(":8888", nil)
}
```
> 本小节 [Diff](https://github.com/bonfy/go-mega-code/commit/50e5028870d4ab7918d391007162c4387540f165)
运行效果图
## Links
* [目录](/master.md)
* 上一节: [01-Hello-World](/01-hello-world.md)
* 下一节: [03-Template-Advance](/03-template-advance.md)
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