NSString *str = @"http%3A%2F%2Fmyimg.ifeng.com%2F200%2F22%2F8a941d71c4df48a5%2F1418632228%2F8a941d71c4df48a5_1.jpg"NSString *str = @"http%3A%2F%2Fmyimg.ifeng.com%
阅读背景：
iOS 将http%3A%2F%2F解析为URL
来源：互联网
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