tuiguangm

business/jxutils/jxutils.go

@@ -893,3 +893,17 @@ func polarTriangleArea(tan1, lng1, tan2, lng2 float64) (s float64) {
 	t := tan1 * tan2
 	return 2 * math.Atan2(t*math.Sin(deltaLng), 1+t*math.Cos(deltaLng))
 }
+
+func GenValidateCode(width int) string {
+	numeric := [36]byte{0, 1, 2, 3, 4, 5, 6, 7, 8, 9,
+		'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L',
+		'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z'}
+	r := len(numeric)
+	rand.Seed(time.Now().UnixNano())
+
+	var sb strings.Builder
+	for i := 0; i < width; i++ {
+		fmt.Fprintf(&sb, "%d", numeric[rand.Intn(r)])
+	}
+	return sb.String()
+}