switch.jpeg
判断区间
switch credit {
case 0...30:
self.creditLab.text = "(credit)分，信用值较差"
case 30...70:
self.creditLab.text = "(credit)分，信用值一般"
case 70...90:
self.creditLab.text = "(credit)分，信用值较好"
default:
self.creditLab.text = "\(credit)分，信用值超好"
}
