vue将对象新增的属性添加到检测序列的方法

deepCopy(o1, o2) { // 将o2的内容拷贝给data中的o1   var key, i   if (o2 instanceof Array) {    for (i = 0; i < o2.length; i++) {     if (o2[i] instanceof Array) {      this.$set(o1, i, [])      this.deepCopy(o1[i], o2[i])     }     else if (o2[i] instanceof Object) {      this.$set(o1, i, {})      this.deepCopy(o1[i], o2[i])     }     else {      this.$set(o1, i, o2[i])     }    }   }   else if (o2 instanceof Object) {    for (key in o2) {     if (o2[key] instanceof Array) {      this.$set(o1, key, [])      this.deepCopy(o1[key], o2[key])     }     else if (o2[key] instanceof Object) {      this.$set(o1, key, {})      this.deepCopy(o1[key], o2[key])     }     else {      this.$set(o1, key, o2[key])     }    }   }   else {    o1 = o2   }}