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stringbyaddingpercentencodingwithallowedcharacters 需要传一个 nscharacterset 对象（关于 nscharacterset 文章说的很好）
如[nscharacterset urlqueryallowedcharacterset]
urlfragmentallowedcharacterset "#%<>[\]^`{|}
urlhostallowedcharacterset "#%/<>?@\^`{|}
urlpasswordallowedcharacterset "#%/:<>?@[\]^`{|}
urlpathallowedcharacterset "#%;<>?[\]^`{|}
urlqueryallowedcharacterset "#%<>[\]^`{|}
urluserallowedcharacterset "#%/:<>?@[\]^`
（2）网络访问请求：中文空格字符解码
stringbyremovingpercentencoding ---- xcode7可能会提示要将stringbyaddingpercentescapesusingencoding替换成此方法，要根据是否是解码来区分
代替 stringbyaddingpercentescapesusingencoding
let customallowedset = nscharacterset(charactersinstring:"`#%^{}\"[]|\\<> ").invertedset
nsstring *urlstr = [urlstr stringbyaddingpercentencodingwithallowedcharacters:[[nscharacterset charactersetwithcharactersinstring:@"?!@#$^&%*+,:;='\"`<>()[]{}/\\| "] invertedset]];
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