请问为啥输出是4，进入的到ch里不是先进先出原则吗，我理解应该是输出是0的呀，求大神解释

package main

import( "fmt" )

func main() {

channelInt := make(chan int)

for i:= 0; i < 5; i++ {
    j := i
    go func(j int) {
        channelInt <- j
    }(j)
}
fmt.Printf("==>%d\n", <-channelInt)

}