捕鱼达人千炮

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                    1. 长春网站建设

                      cript一致和不一致的规则使用方法

                      时间:2018-02-04 12:25 来源:irineindia.com 作者:佰亿金科 浏览次数:


                      长春网站建设确定两个变量是否相等是一个非常重要的操作编程。当相等比较字符串值和布尔值,这个问题比较简单。但是,当涉及到的比较,问题就变得复杂。

                      ZAIYUNYINGSHANGDEECMAScriptZUIZAOJIANGSHIZHIXINGSUOSHUBIJIAO,SUOSHUDIYIDUIXIANGDAOXIANGSILEIXINGZHIQIANXIANGDENGHEBUDENG。HOULAI,YOURENJIANYI,ZAINIANDIZHEIZHONGZHUANHUANSHIFOUHELIDEWENTI:ZUIHOU,ECMAScriptDEJIEJUEFANGANSHITIGONGLIANGTAOYUNYINGSHANG:PINGDENGHEBUPINGDENGDE - RANHOUBIJIAODIYICIZHUANHUAN,YIZHIHEBUYIZHI - ZHIYOUBUZHUANHUANBIJIAO。

                      捕鱼达人千炮 1。PINGDENGHEBUPINGDENG

                      DEECMAScriptSHIDENGYUYOUDENGHAO(==)BIAOSHIDELIANGGECAOZUOYUAN,RUGUOZHEILIANGGECAOZUOSHUXIANGDENG,ZEFANHUItrue。DENGYUYUNSUANFUBUDENGYUSUIHOUGANTANHAOSHU(!- )BIAOSHI,RUGUOLIANGGECAOZUOSHUBUXIANGDENG,ZEFANHUItrue。ZHEILIANGGECAOZUOFUSHIDIYIBIANHUANDECAOZUOSHU(TONGCHANGBEICHENGWEITOUSHE),RANHOUBIJIAOTAMENDEXIANGDENG。

                      DANGZHUANHUANBUTONGDESHUJULEIXING,PINGDENGHEBUPINGDENGDEYUNYINGSHANGZUNXUNYIXIAJIBENYUANZE:

                      QIAN◎RUGUOCAOZUOSHUSHIYIBUERZHI,ZEDIYIBIJIAOequalityZHANGCHUNWANGZHANWhichBEIZHUANHUANWEISHUZHI-falseZHUANHUANWEI0HELBEIZHUANHUANWEItrue;

                      ◎RUGUOCAOZUOSHUSHIYIGEZIFUCHUAN,QITACAOZUOSHUSHISUOSHUDIYIZIFUCHUANHUAFENWEIXIANGDENGZHIDEBIJIAOZHIQIANDEZHI;

                      ◎RUGUOCAOZUOSHUSHIYIGEDUIXIANG,ZELINGYIGECAOZUOSHUBUSHI,DIAOYONGGAIDUIXIANGDEDEvalueOf()FANGFA,YUGENJUQIANSHUGUIZEHUODEDEYUANSHIZHIJINXINGBIJIAO;

                      捕鱼达人千炮 ZHEILIANGJIAYUNYINGSHANGJINXINGBIJIAO,JIANGBUDEBUZUNXUNZHEIXIEGUIZE。

                      捕鱼达人千炮 ◎nullHEundefinedXIANGDENG。

                      捕鱼达人千炮 ◎PINGDENGBIJIAOZHIQIAN,HEKONGBUNENGZHUANHUANCHENGQITASHENGHUOLIJIEGUOCHENGFAKUANZHIH0。

                      捕鱼达人千炮 ◎RUGUOCAOZUOSHUSHIWEINaN,ZEDENGYUYUNSUANFUFANHUIfalse,YUNYINGSHANGBUDENGYUFANHUItrue。ZHONGYAOTISHI:

                      捕鱼达人千炮 JISHILIANGGECAOZUOSHUWEINaN,XIANGDANGYUYUNYINGSHANGHAIFANHUIfalse; YINWEIGENJUGUIZE,NaNDEBUXIANGDENGDENaN。

                      ◎RUGUOLIANGGECAOZUOSHUSHIDUIXIANG,ZEspecificZHANGCHUNWANGZHANTheYUEDUO,TAMENSHIBUSHITONGYIGEDUIXIANG。RUGUOLIANGGECAOZUOSHUZHIXIANGTONGYIGEDUIXIANG,

                      DENGYUYUNSUANFUFANHUItrue; FOUZE,FANHUIfalse。

                      XIABIAOLIECHULEYIXIETESHUQINGKUANG,BINGBIJIAOJIEGUO:

                      BIAOQINGZHIBIAODASHIZHI

                      捕鱼达人千炮 KONG== == undefinedtruetrue 1true

                      捕鱼达人千炮 “NAN” == == NaNfalsetrue 2false

                      5 == NaNfalseundefined == 0false

                      NaNDE== == NaNfalsenull 0false

                      NaN != NaNtrue “5” == 5true

                      JIA== 0true

                      2。YIZHIHEBUYIZHI

                      长春网站

                      BUTONGZHICHUZAIYUMEIYOUZHUANHUANZHIQIANDEBIJIAOCAOZUOSHU,CAOZUOFUYIZHIHEBUYIZHIYONGDENGSHIHEBUDENGSHICAOZUOZHEMEIYOUCHABIE。CAOZUOZHEQUANDENGXIANGDENGSHUMUDEYOUTU3(a)ZHONG,ZHIYOUZAILIANGGECAOZUOSHUDOUWUXUZHUANHUANXIANGDENGDEQINGKUANGXIAFANHUItrueBIAOSHI,RUXIA MIANDESHISHILIZHONGSUOSHI:

                      捕鱼达人千炮 VAR resultl =( “55” == 55); //RUCI,YINWEIZHUANHUALVDENGYU

                      VAR RESULT2 2( “55” === 55); //JIA,YINWEIBUTONGLEIXINGDESHUJUSHIBUXIANGDENGDE

                      ZAIZHEIGELIZIZHONG,SHIYONGDENGYUYUNSUANFUBIJIAOZIFUCHUAN“55”,BINGQIEZHI55DEDIYIBIJIAO,JIEGUOFANHUIZHEN。

                      捕鱼达人千炮 RUSHANGSUOSHU,YOUYUZIFUCHUAN“55”BEIZHUANHUANWEIDIYIZHI55,RANHOUYONGLINGYIGEZHI55XIANGBI。DIERGEBIJIAOSHIYONGDEQUANDENGSANGCAOZUO,YIMIANBIJIAOZHIDEJIAZHIHEXIANGTONGDEZIFUCHUANZHUANHUAN。WUXUZHUANHUAN,DANGRANSHIBUDENGYUZIFUCHUANZHI,SUOYIJIEGUOSHIJIA。

                      捕鱼达人千炮 TONGGUOQITACAOZUOYUANGANTANHAOHOUGENLIANGGESHUZIDEGUZHANGSHIDENGYU(!==)BIAOMING,ZAILIANGGECAOZUOSHUDEQINGKUANGXIAFANHUIDUNYUNXIANGBUDENGYUWEIZHUANHUA。E。G:

                      Changchun Website

                      捕鱼达人千炮 VAR resultl =( “55”!= 55)。J //JIA,YOUYUZHUANHUALVDENGYU

                      VAR RESULT2 2( “55”! == 55); //ZHENGQUEDE,YINWEIBUTONGLEIXINGDESHUJUSHIBUXIANGDENGDE

                      ZAIZHEIGELIZIZHONG,SHIYONGBUXIANGDENGDECAOZUOZHEDEDEBIJIAO,BINGQIECAOZUOZHEJIANGZIFUCHUAN“55”BEIZHUANHUANWEI55,HEJIEGUODEDIERSHULIANG(55)DENGYUCAOZUO。ERQIE,YOUYULIANGGECAOZUOSHUBEISHIWEIXIANGDENG,ZEFANHUIfalse。DIERGEBIJIAOCAOZUOZHESHIYONGBUZU。RUGUOWOMENZHEIYANGRENWEI:55HE55DEZIFUCHUANZHIBUZHEIYANGZUO?,NEIMEDAANYIDINGSHI:SHI(ZHEN)。

                      长春网站建设公司网页设计公司提醒:由于平等和不平等的运营商类型转换的问题存在,以维持在代码中的数据类型的完整性,我们建议使用一致和不一致运营商。

                      捕鱼达人千炮 WOMENXIWANGZHEIGEGUANGDACHEZHUHUOQIYECONGSHIWANGZHANJIANSHEGONGSIDETUANDUIBANGZHU,XIANGZHEIYANGBUMINGBAIDE,KEYILIANXIWANGLUOZHANGCHUNWANGLUOJISHU。WOMENHENGAOXINGNENGYUGUANGDACONGSHIWANGZHANJIANSHEGONGSIJISHURENYUANYEZHUHEQIYEFENXIANGWOMENDEJISHUHEJINGYAN。

                       

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