公交卡在网上充值的方法：
最方便的方式就是用支付宝充值，但是需要手机支持NFC功能，不知此NFC功能的手机，无法给公交卡充值，首先打开支付宝。
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需要的应用，在扩展选项中可以找到。
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点开扩展后，打开城市一卡通小应用。
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将公交卡放到NFC感应区，就可以按照提示给公交卡充值。
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城市中乘坐公交车时一般都使用IC卡。有专门的公交卡，也有和银行卡合用的公交卡，即既可以当银行卡使用，也可以当作公交卡使用。目前还有和手机SIM卡放在一起的移动公交卡。在公交车上可以刷手机消费，出门不再需要带一堆的散钱，既方便又时尚。
