Javascript的.includes函数与对象数组无法正常工作 [英] Javascript's .includes function not working correctly with array of objects

问题描述

我有一个对象数组，我正在使用 .includes（）函数。我正在使用数组中的对象搜索此数组（对象相同）。但是似乎没有匹配。我已经在这个小提琴中复制了这个问题。代码也在下面。那么检查数组是否包含对象的正确方法是什么？

I have an array of objects which I'm using the .includes() function. I'm searching this array with an object that is in the array (Objects are identical). However there doesn't appear to be a match. I have replicated the problem in this fiddle. The code is also below. So what is the correct way to check if an array contains am object?

let list1 = [{
    name: "object1"
  },
  {
    name: "object2"
  },
  {
    name: "object3"
  },
  {
    name: "object4"
  }
]


if (list1.includes({
    name: "object1"
  })) {
  document.write('contains')
} else {
  document.write('doesnt')
}

推荐答案

您无法直接比较对象，但使用此方法，您可以将它们与JSON.stringify进行比较。

You can't compare objects directly, but using this method , you can compare them with JSON.stringify.

let list1 = [{
    name: "object1"
  },
  {
    name: "object2"
  },
  {
    name: "object3"
  },
  {
    name: "object4"
  }
]

var contains = list1.some(elem =>{
  return JSON.stringify({name: "object1"}) === JSON.stringify(elem);
});
if (contains) {
  document.write('contains')
} else {
  document.write('doesnt')
}

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