Java script: Remove the empty string value

    /**     *  @title   Remove null values in the string ', ' as a delimiter       *          gets the individual fields from the database when its value is ', ' * * *, ' * *, ', '   "," * * * "' when,     *          This method can be used to remove the first delimiter and the empty part of the data,     *           The string into the normal data string '   ' * * * *, ' * * * ', ' * * * '   '      *  @param   STR: string to convert      *  @return      */     public string strchange (STRING STR) {         Return strchange (str,null);     }        /**      *  @title   Remove null values in a string      *           the individual fields obtained from the database, when their valuesFor ', ' * * * ', ' * * * ', '   ', ' * * * ' when,     *           can use this method to remove the first delimiter and the empty part of the data,     *           the string into the normal data string '   ' * * * *, ' * * * ', ' * * * '   '      *  @param  STR: String to convert      *  @param  split :  delimiter (default = ', ')       *  @return      */    public string  strchange (string str,string split) {        //1, If the separator is empty, the default is ', '         if (split.trim () = = ""  | |  split == null) {            split= " , ";         }        //2, Convert a string to an array         sTring[] arr=str.split (split);         //3, defining intermediate variables value         string value= "";         //4, Iterates through the array, adding it to value if the subscript index corresponds to a value of null or an empty string         for  (string  S : arr)  {            // Note: If the string is judged to be empty, be sure to trim () because: "    " .length != 0             if (S!=null && s.trim (). IsEmpty ())                  value+=s+split;         }        //5, if value is empty, Returns null, not empty, then the last character of value is removed and then returned to         return value==null?null: Value.substring (0, value.length ()-1);    } 

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Java script: Remove the empty string value