如何检查数组在特定对象属性上是否唯一？

I have an array of objects:

我有一个对象数组:

var array1 = [
  {
    property1: 10,
    property2: "abc"
  }, 
  {
    property1: 11,
    property2: "def"
  },
  {
    property1: 10,
    property2: "ghi"
  }
];
var a