golang text/template的用法： if, else, with

golang的text/template 包在使用的时候还是有些不便，特别是涉及到逻辑判断的时候。经过测试，发现下面这种写法是正确的。 1.2.1的环境下没有问题！

相关资料：https://gowalker.org/text/template  。

eq是一个函数。

package main

import "text/template"
import "os"

func main() {

	type Inventory struct {
		Material string
		Count    int
	}
	sweaters := Inventory{"axe", 0}
	html := `
	"test").Parse("{{.Count}} items are made of {{.Material}}"
	{{$a := .Count}}
	{{$b := 17}}
	{{$c := 18}}	
  
	{{if eq  .Count $b}}
	oo
	{{else}}
	xx
	{{end}}

	`
	tmpl, err := template.New("test").Parse(html)
	if err != nil {
		panic(err)
	}
	err = tmpl.Execute(os.Stdout, sweaters)
	if err != nil {
		panic(err)
	}

}

{{len .Statistics | print}}
{{$le:= len .Statistics}}

{{if eq $le 0}}  
    is 0  
{{else}}  
    not 0  
{{end}}

if/else 与or, eq函数的用法

{{else if or (eq $e.Status -2) (eq $e.Status -3)}}

{{with and ($et := .Extension) ($ch := .Changelog) }}
{{range $e := $ch}}
...
{{$et.Name}} {{$e.Version}}

{{end}}
{{end}}

补充：

There is a variable, $, that you can use to solve your problem. From the text/template docs: "When execution begins, $ is set to the data argument passed to Execute, that is, to the starting value of dot." In your case:

{{with  ($ch := .Changelog) }}

{{range $e := $ch}}




{{$e.CreateTime}} html1



{{with ($u:= $.User)}}
html2

{{end}}


{{end}}
{{end}}

支持的语法虽然少，但是完全够用！