知识补充区

bool, for JSON booleans
float64, for JSON numbers
string, for JSON strings
[]interface{}, for JSON arrays
map[string]interface{}, for JSON objects
nil for JSON null

func replace(text string, replacement map[string]string) string {
	var leftPad, rightPad = `{{`, `}}`
	var rgx = regexp.MustCompile(leftPad + "(.*?)" + rightPad)
	rs := rgx.ReplaceAllFunc([]byte(text), func(bytes []byte) []byte {
		key := bytes[len(leftPad) : len(bytes)-len(rightPad)]
		log.Println(string(key))
		if val, ok := replacement[string(key)]; ok && val != "" {
			return []byte(val)
		}
		return bytes
	})
	return string(rs)
}