33 lines
814 B
Go
33 lines
814 B
Go
package main
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import "fmt"
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func main() {
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data := []string{"one","two","three"}
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// 非正确的捕获方式
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wrongFunctions := make([]func(), 0, 3)
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for _, v := range data {
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wrongFunctions = append(wrongFunctions, func() {
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fmt.Println(v)
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})
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}
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for _, wrongFunc := range wrongFunctions {
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wrongFunc() // 输出 three three three，而不是期望的 one two three
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}
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// 正确的捕获方式
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correctFunctions := make([]func(), 0, 3)
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for _, v := range data {
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value := v // 将值复制到了函数的每个局部版本
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correctFunctions = append(correctFunctions, func() {
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fmt.Println(value)
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})
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}
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for _, correctFunc := range correctFunctions {
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correctFunc() // 输出 one two three
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}
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}
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