objIsEqual(obj1,obj2){//比較兩個對象鍵值對是否相等
            var o1 = obj1 instanceof Object;
            var o2 = obj2 instanceof Object;
            if(!o1 || !o2){/*  判斷不是對象  */
                return obj1 === obj2;
            }

            if(Object.keys(obj1).length !== Object.keys(obj2).length){
                return false;
                //Object.keys() 返回一個由對象的自身可枚舉屬性(key值)組成的數組,例如：數組返回下表：let arr = ["a", "b", "c"];console.log(Object.keys(arr))->0,1,2;
            }

            for(var attr in obj1){
                var t1 = obj1[attr] instanceof Object;
                var t2 = obj2[attr] instanceof Object;
                if(t1 && t2){
                    return diff(obj1[attr],obj2[attr]);
                }else if(obj1[attr] !== obj2[attr]){
                    return false;
                }
            }
            return true;
        }
 

javascript判斷兩個對象屬性以及值是否相等