替换空格-golang
func replaceSpaces(str string) string {
strNew := make([]rune, 0, len(str)*2)
for _, v := range []rune(str){
if v == []rune(" ")[0]{
strNew = append(strNew, []rune("%20")...)
}else{
strNew = append(strNew, v)
}
}
return string(strNew)
}