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因为mysql查询的时候精确到空格，所以，想要去去除中间的空格除了用正则以外，mysql写法：select * from cityall where trim(replace(cityEn,' ','')) = trim(replace('San Fra nc i s c o',' ','')) and trim(replace(countryEn,' ','')) = trim(replace('UnitedStates',' ',''));...

一、去除字符串中首尾的空格方法一:使用正则表达式functiontrim( str ){returnstr.replace(/(^\s*)|(\s*$)/g,"");}方法二:使用字符串的trim()方法functiontrim( str ){returnstr.trim();}方法三:使用jQuery的$.trim()方法varres = $.trim( str );二、去除字符串首尾空格和中间的空格方法一:简单的正则functiontrim( str ){retu