code: function(lastope){
  		// 前回と同じ場所なら前回の更新のみ
  		var property = this.property;
  		if( lastope.group    === this.group &&
  			lastope.property === this.property  &&
  			lastope.num      === this.old   &&
  			lastope.bx       === this.bx    &&
  			lastope.by       === this.by    &&
  			(property === 'qnum'  || 
  			 property === 'qnum2' ||
  			 property === 'qchar' ||
  			 property === 'anum'  ||
  			(property === 'snum' && lastope.pos === this.pos))
  		)
  		{
  			lastope.num = this.num;
  			return true;
  		}
  		return false;
  	}
docs: --------------------------------------------------------------------------- ope.isModify()  前の履歴をこのオブジェクトで更新するかどうか確認する ---------------------------------------------------------------------------