wg能不能多线程Wait

package main

import (
	"fmt"
	"sync"
)

func main() {
	wg := sync.WaitGroup{}
	wg.Add(1)
	for i := 0; i < 3; i++ {
		go func(i int) {
			wg.Wait()
			fmt.Printf("%d done\n", i)
		}(i)
	}
	wg.Done()
	fmt.Println("main done")
}

package main

import (
	"fmt"
	"sync"
)

func main() {
	wg := sync.WaitGroup{}
	wg.Add(1)
	for i := 0; i < 3; i++ {
		go func(i int) {
			wg.Wait()
			fmt.Printf("%d done\n", i)
		}(i)
	}
	wg.Done()
	fmt.Println("main done")
}