golang截取字符串的性能相差200倍

package main

import (
	"fmt"
	"log"
	"strings"
	"time"
)

func main() {
	str := "sum::goods_num"
	var content,content1 string
	var i int
	start1 := time.Now()
	for i = 0;i<1000000;i++ {
		content = str[5 : ]
	}
	elapsed := time.Since(start1)
	fmt.Println(elapsed)
	log.Println(content)
	start2 := time.Now()
	for i = 0;i<1000000;i++ {
		selectStruct := strings.Split(str, "::")
		if len(selectStruct) != 2 {
			log.Println("select format error")
		}

		content1 = selectStruct[1]
	}
	elapsed1 := time.Since(start2)
	fmt.Println(elapsed1)
	log.Println(content1)
}

性能对比如下：

558.996µs
2019/07/30 10:49:16 goods_num
118.718357ms
2019/07/30 10:49:16 goods_num

Process finished with exit code 0

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