//4.以某一特定位置来截取字符串varstring="https://www.baidu.com"letrange=string.range(of:"baidu")letlowerStr=string.substring(to:(range?.lowerBound)!)//结果为:https://www.print("tolowerstring:\(lowerStr)")letupperStr=string.substring(to:(range?.upperBound)!..
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其他好文 时间:
2017-04-30 23:05:21
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