如何从对象内部的数组中删除特定对象? (使用pop()或其他解决方案) [英] How is the specific object removed from the array inside the object? (with pop() or another solution)

问题描述

我想从myObj的年份中删除"hello5".

I want to remove the 'hello5' from the years in myObj.

我使用了"pop"原型，但浏览器控制台返回了此结果:

I used 'pop' prototype, but the browser console return this result :

'未捕获的TypeError:无法读取未定义的属性'type''

以下是我的问题的示例.您可以尝试从控制台查看错误消息.

The following is an example for my issue. You could try and will see error message from console.

我尝试了很长时间，但没有找到任何解决方案，我需要您的建议和解决方案.

I tried a long time but I didn't find any solution, I need your advise and solution.

代码:

var myObj = {
  test : 'testObje',
  langs : {
    0 : 'EN',
    1 : 'GR',
    2 : 'RU',
    3 : 'TR'
  },
  comment : 'testComment'
};
var years = [];
  for (i= 0; i<=10; i++)
    {
      years.push({
        operator : i,
        type : 'hello' + i
      });
};
myObj.years = years;

var myObjLeng = myObj.years.length;
for(var i = 0; i < myObjLeng; i++) {
    if(myObj.years[i].type == 'hello5') {
        myObj.years.pop();
    }
}

推荐答案

这里有一些不错的选择，所以让我me一下为什么会出现该错误.

There are some good alternatives here, so let me just take a stab at why you're getting that error.

由于更改数组中循环的长度，导致出现此错误.在循环的开始，您有11个元素，并使用该元素定义for循环将运行多少次.到达hello5时，关闭pop最后一个元素，使数组长10个元素.但是，您的for循环仍将尝试访问第11个元素.这将是undefined，并且当您尝试访问undefined的属性(例如type)时，会出现TypeError.

You're getting that error because you're changing the length of the array mid-loop. At the beginning of the loop, you have 11 elements, and you use that to define how many times your for loop will go. When you get to hello5, you pop the last element off, making your array 10 elements long. However, your for loop will still try to access the 11th element. That will be undefined, and when you try to access a proprty of undefined (e.g. type), you will get a TypeError.

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