Go模板表达式

huangapple
go评论118阅读模式
英文:

Go template expression

问题

  1. {{$Total := 0.00}}
  2. {{ range .Shoes }}
  3.   {{ if .Quantity }}
  4.     {{ $Total := add $Total (mul .Price .Quantity)}}
  5.   {{ end }}
  6. {{ end }}
  7. {{printf "%.2f" $Total}}

函数"add"未定义

总价 * 数量 = 最终价格

英文: 
  1. {{$Total := 0.00}}
  2. {{ range .Shoes }}
  3.   {{ if .Quantity }}
  4.     {{ $Total := add $Total (mul .Price .Quantity)}}
  5.   {{ end }}
  6. {{ end }}
  7. {{printf "%.2f" $Total}}

function "add" not defined

Total price * Quantity = Final Price

答案1

得分: 3

  1. package main
  3. import (
  4. 	"bytes"
  5. 	"fmt"
  6. 	"text/template"
  7. )
  9. func add(total, prod float64) float64 {
  10. 	return total + prod
  11. }
  12. func mul(quantity, price float64) float64 {
  13. 	return quantity * price
  14. }
  16. var funcMap = template.FuncMap{
  17. 	"add": add,
  18. 	"mul": mul,
  19. }
  21. func main() {
  22. 	t := template.Must(template.New("test").Funcs(funcMap).Parse(tmpl))
  23. 	var tpl bytes.Buffer
  24. 	b := TMPL{
  25. 		Total: 0,
  26. 		Shoes: []Shoe{
  27. 			Shoe{
  28. 				Quantity: 5,
  29. 				Price:    20,
  30. 			},
  31. 		},
  32. 	}
  33. 	err := t.Execute(&tpl, &b)
  34. 	if err != nil {
  35. 		fmt.Println(err)
  36. 	}
  37. 	fmt.Println(tpl.String())
  38. }
  40. type TMPL struct {
  41. 	Total int
  42. 	Shoes []Shoe
  43. }
  45. type Shoe struct {
  46. 	Quantity float64
  47. 	Price    float64
  48. }
  50. var tmpl = `{{$Total := 0.00}}
  51. {{ range .Shoes }}
  52.   {{ if .Quantity }}
  53.     {{$Total = (add $Total (mul .Price .Quantity))}}
  54.   {{ end }}
  55. {{ end }}
  56. {{printf "%.2f" $Total}}

playground

  2. 以上是你提供的代码的翻译结果。
  4. <details>
  5. <summary>英文:</summary>
  7.     
  8.     package main
  9.     
  10.     import (
  11.     	&quot;bytes&quot;
  12.     	&quot;fmt&quot;
  13.     	&quot;text/template&quot;
  14.     )
  15.     
  16.     func add(total, prod float64) float64 {
  17.     	return total + prod
  18.     }
  19.     func mul(quantity, price float64) float64 {
  20.     	return quantity * price
  21.     }
  22.     
  23.     var funcMap = template.FuncMap{
  24.     	&quot;add&quot;: add,
  25.     	&quot;mul&quot;: mul,
  26.     }
  27.     
  28.     func main() {
  29.     	t := template.Must(template.New(&quot;test&quot;).Funcs(funcMap).Parse(tmpl))
  30.     	var tpl bytes.Buffer
  31.     	b := TMPL{
  32.     		Shoes: []Shoe{
  33.     			Shoe{
  34.     				5,
  35.     				20,
  36.     			},
  37.     		},
  38.     	}
  39.     	err := t.Execute(&amp;tpl, &amp;b)
  40.     	if err != nil {
  41.     		fmt.Println(err)
  42.     	}
  43.     	fmt.Println(tpl.String())
  44.     }
  45.     
  46.     type TMPL struct {
  47.     	Total int
  48.     	Shoes []Shoe
  49.     }
  50.     
  51.     type Shoe struct {
  52.     	Quantity float64
  53.     	Price    float64
  54.     }
  55.     
  56.     var tmpl = `{{$Total := 0.00}}
  57.     {{ range .Shoes }}
  58.       {{ if .Quantity }}
  59.         {{ $Total = (add $Total (mul .Price .Quantity))}}
  60.       {{ end }}
  61.     {{ end }}
  62.     {{printf &quot;%.2f&quot; $Total}}
  65. [playground][1]
  68.   [1]: https://go.dev/play/p/RZ_qkM3pyBX
  70. </details>

huangapple
  • 本文由 发表于 2023年2月9日 11:31:29
  • 转载请务必保留本文链接：https://go.coder-hub.com/75393914.html
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