Function if

component/Calender.js:189–191

(i < index)

        for(let i = 0; i < dateCount + index; i ++){
            if (i < index) {
                matrixNodes[0].push(<td key={`canlender-col-${i}`}></td>);
            } else {
                const _index = i - index + 1;
                const row = Math.floor(i / 7);
                const itemDateStr = obj2DateStr(year, month, _index);