이상하다 https://stackoverflow.com/questions/881085/count-the-number-of-occurrences-of-a-character-in-a-string-in-javascript If you're looking for the commas: (mainStr. split ( "," ). length - 1 ) //3 If you're looking for the str (mainStr. split ( "str" ). length - 1 ) //4 console . log (( "str1,str2,str3,str4" . match ( /,/g ) || []). length ); //logs 3 console . log (( "str1,str2,str3,str4" . match ( new RegExp ( "str" , "g" )) || []). length ); //logs 4
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