如何在 Go 中打印到 HTML 模板？ 来源：https ://github.com/timpalpant/go-iex我必须在 go 代码和 html 模板中遗漏很多东西。我正在寻找一种通过将值打印到 HTML 模板来解决问题的方法：package mainimport ( "fmt" "html/template" "net/http" "github.com/timpalpant/go-iex")func process(w http.ResponseWriter, r *http.Request) { client := iex.NewClient(&http.Client{}) quotes, err := client.GetTOPS([]string{"AAPL", "SPY"}) if err != nil { panic(err) } var s string for _, quote := range quotes { s := fmt.Sprintf("%v: bid $%.02f (%v shares), ask $%.02f (%v shares) [as of %v]\n", quote.Symbol, quote.BidPrice, quote.BidSize, quote.AskPrice, quote.AskSize, quote.LastUpdated) } t, _ := template.ParseFiles("test.html") quote := s t.Execute(w, quote)}func main() { server := http.Server{ Addr: "127.0.0.1:8080", } http.HandleFunc("/process", process) server.ListenAndServe()}这是 HMTL 模板<!DOCTYPE html><html> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8"> <title>Go Web Programming</title> </head> <body> <ul> {{ range . }} <li>{{ . }}</li> {{ end}} </ul> </body></html>错误：./web.go:22:5: 已声明但未使用
2 回答
婷婷同学_
TA贡献1844条经验 获得超8个赞
在循环内部，您通过 usingfor重新声明s为新的循环范围变量s :=，如下面的代码所示。您永远不会在其范围内使用该特定变量，因此会出现错误：s declared and not used.
// this instance of s is scoped to the function
var s string
for _, quote := range quotes {
// *** this instance of s is only scoped to loop and it's not actually used within loop ***//
s := fmt.Sprintf("%v: bid $%.02f (%v shares), ask $%.02f (%v shares) [as of %v]\n",
quote.Symbol, quote.BidPrice, quote.BidSize,
quote.AskPrice, quote.AskSize, quote.LastUpdated)
}
相反，s :=改为 this s =，如下所示。但是，您还没有完成，请在下面进一步阅读。
var s string
for _, quote := range quotes {
s = fmt.Sprintf("%v: bid $%.02f (%v shares), ask $%.02f (%v shares) [as of %v]\n",
quote.Symbol, quote.BidPrice, quote.BidSize,
quote.AskPrice, quote.AskSize, quote.LastUpdated)
}
使用上面的代码将覆盖s循环的每次迭代的值。如果您想保留循环中生成的每个字符串并将它们全部打印到模板中，请创建一个字符串切片并附加到它...
// Create s as a slice of string
var s []string
for _, quote := range quotes {
// append each result from loop to slice
s = append(s, fmt.Sprintf("%v: bid $%.02f (%v shares), ask $%.02f (%v shares) [as of %v]\n",
quote.Symbol, quote.BidPrice, quote.BidSize,
quote.AskPrice, quote.AskSize, quote.LastUpdated))
}
这是 html 模板中的输出，它现在包括s切片中的所有值...
慕的地8271018
TA贡献1796条经验 获得超4个赞
您正在重新定义流程函数中的 s 。
var s string
for _, quote := range quotes {
s = fmt.Sprintf("%v: bid $%.02f (%v shares), ask $%.02f (%v shares) [as of %v]\n",
quote.Symbol, quote.BidPrice, quote.BidSize,
quote.AskPrice, quote.AskSize, quote.LastUpdated)
// ****************REMOVE s:= from here.**********
}
例子：
func main() {
s := ""
items := []int{1}
for _, quote := range items {
s = "1"
fmt.Println(quote)
}
fmt.Println(s)
}
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