objA = {"D組": {"title":"D組","val":1,"unit":"bar"},"C組": {"title":"C組","val":1,"unit":"bar"},"B組": {"title":"B組","val":1,"unit":"bar"},"A組": {"title":"A組","val":1,"unit":"bar"},"右上土壓": {"title":"右上土壓","val":1,"unit":"bar"},"右下土壓": {"title":"右下土壓","val":1,"unit":"bar"},"上部土壓": {"title":"上部土壓","val":1,"unit":"bar"},"左上土壓": {"title":"左上土壓","val":1,"unit":"bar"},"左下土壓": {"title":"左下土壓","val":1,"unit":"bar"}};objB = {"D組": 0,"C組": 0,"B組": 0,"A組": 0,"右上土壓": 0,"右下土壓": 0,"上部土壓": 0,"左上土壓": 0,"左下土壓": 0};如何用es6方法將后者的值賦值給前者的val?真實的數據結構比這個要復雜，求大神給個思路。