People Lack Willpower，Rather Than Strength！
1.NSString Class introduction
- length VS strlen
- length:OC 计算字符串方法, 计算的是字符个数(无论中英文)
- strlen:C 中计算字符串函数,计算的是英文字符个数! 64bits下中文占3个字符.
People Lack Willpower，Rather Than Strength！
1.NSString Class introduction length VS strlenlength:OC 计...
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