一线的答案是
fmt.Sprint(i)。
无论如何，甚至在标准库函数（例如）内部都有很多转换，
fmt.Sprint(i)因此您有一些选择（尝试使用Go
Playground）：
1-您可以编写转换函数（ 最快 ）：
func String(n int32) string { buf := [11]byte{} pos := len(buf) i := int64(n) signed := i < 0 if signed { i = -i } for { pos-- buf[pos], i = '0'+byte(i%10), i/10 if i == 0 { if signed { pos-- buf[pos] = '-' } return string(buf[pos:]) } }}2-您可以使用
fmt.Sprint(i)（ 慢 ）
参见内部：
// Sprint formats using the default formats for its operands and returns the resulting string.// Spaces are added between operands when neither is a string.func Sprint(a ...interface{}) string { p := newPrinter() p.doPrint(a) s := string(p.buf) p.free() return s}3-您可以使用
strconv.Itoa(int(i))（ 快速 ）
参见内部：
// Itoa is shorthand for FormatInt(int64(i), 10).func Itoa(i int) string { return FormatInt(int64(i), 10)}4-您可以使用
strconv.FormatInt(int64(i), 10)（ 更快 ）
请参阅内部：
// FormatInt returns the string representation of i in the given base,// for 2 <= base <= 36. The result uses the lower-case letters 'a' to 'z'// for digit values >= 10.func FormatInt(i int64, base int) string { _, s := formatBits(nil, uint64(i), base, i < 0, false) return s}比较和基准测试（具有50000000次迭代）：
s = String(i) takes: 5.5923198ss = String2(i)takes: 5.5923199ss = strconv.FormatInt(int64(i), 10) takes: 5.9133382ss = strconv.Itoa(int(i)) takes: 5.9763418ss = fmt.Sprint(i) takes: 13.5697761s
码：
package mainimport ( "fmt" //"strconv" "time")func main() { var s string i := int32(-2147483648) t := time.Now() for j := 0; j < 50000000; j++ { s = String(i) //5.5923198s //s = String2(i) //5.5923199s //s = strconv.FormatInt(int64(i), 10) // 5.9133382s //s = strconv.Itoa(int(i)) //5.9763418s //s = fmt.Sprint(i) // 13.5697761s } fmt.Println(time.Since(t)) fmt.Println(s)}func String(n int32) string { buf := [11]byte{} pos := len(buf) i := int64(n) signed := i < 0 if signed { i = -i } for { pos-- buf[pos], i = '0'+byte(i%10), i/10 if i == 0 { if signed { pos-- buf[pos] = '-' } return string(buf[pos:]) } }}func String2(n int32) string { buf := [11]byte{} pos := len(buf) i, q := int64(n), int64(0) signed := i < 0 if signed { i = -i } for { pos-- q = i / 10 buf[pos], i = '0'+byte(i-10*q), q if i == 0 { if signed { pos-- buf[pos] = '-' } return string(buf[pos:]) } }}
