Question

我正在学习功能性的javascript。还是新手。我有个问题： 如何更改此对象

var object = {
    "person1": {
        "name": "Bob",
        "last": "Smith"
    },
    "person2": {
        "name": "John",
        "last": "Smith"
    },
    "person3": {
        "name": "Jane",
        "last": "Smith"
    }
}

进入此。（最好有一些功能风格）

  var object = {
    "person1": {
        "no": 1, 
        "name": "Bob",
        "last": "Smith"
    },
    "person2": {
        "no": 2,
        "name": "John",
        "last": "Smith"
    },
    "person3": {
        "no": 3,
        "name": "Jane",
        "last": "Smith"
    }
}

我的第一个想法是使用对象大小并使用长度

制作数组

makeArray = function(obj){
             for (key in obj) {
               var number = [];
               if (obj.hasOwnProperty(key)) size++;
               number.push(size);
             }; 
             return number;
          };

所以myArray = makeArray(object); myArray = [1,2,3]; //1,2,3 instead 0,1,2 所以我得到1,2,3号而不是0,1,2。但我如何将其推入个人person.properties

感谢，

Answer 1

要使makeArray功能起作用，您应该：

在循环外部初始化数组
在函数中声明计数器并在循环外部将其初始化
仅在找到属性时推送计数器

代码：

function makeArray(obj){
  var number = [], size = 0;
  for (key in obj) {
    if (obj.hasOwnProperty(key)) {
      size++;
      number.push(size);
    }
  } 
  return number;
}

如果要设置对象的no属性：

function setNo(obj){
  var size = 0;
  for (key in obj) {
    if (obj.hasOwnProperty(key)) {
      size++;
      obj[key].no = size;
    }
  }
}

Answer 2

new Timer().scheduleAtFixedRate(new TimerTask() {
    @Override
    public void run() {
        if (counter <= 10)
            newimg();
        else
        // here I want to stop the timer so it will not try to create any more `ImageViews`   (the array contains only 10).
    }
}, 0, 5000);

private void newimg() {
    ball[counter] = new ImageView(this);
    ball[counter].setTag(counter);
    ball[counter].setBackgroundResource(R.mipmap.ball);
    int randomx = rand.nextInt(layoutwidth);
    int randomy = rand.nextInt(layoutheight);
    ball[counter].setX(randomx);
    ball[counter].setY(randomy);
    rlt.addView(ball[counter]);
    counter++;
}

具有功能Javascript的序列对象

2 个答案: