合并两个数组并按ID比较添加新属性

function mergeArrays(arr1, arr2) {
  var mergedArray = [];

  arr1.forEach(function(item1) {
    var found = false;
    var id1 = item1.ID;

    arr2.forEach(function(item2) {
      var id2 = item2.ID;

      if (id1 === id2) {
        item1.newProperty = item2.property;
        found = true;
      }
    });

    if (!found) {
      // 可以选择添加默认属性或者忽略该元素
      // item1.newProperty = "default";
    }

    mergedArray.push(item1);
  });

  // 将第二个数组中剩余的元素添加到结果数组中
  arr2.forEach(function(item2) {
    var id2 = item2.ID;

    var found = arr1.some(function(item1) {
      return item1.ID === id2;
    });

    if (!found) {
      // 可以选择添加默认属性或者忽略该元素
      // item2.newProperty = "default";
      mergedArray.push(item2);
    }
  });

  return mergedArray;
}

// 示例用法
var array1 = [
  { ID: 1, name: "John" },
  { ID: 2, name: "Jane" },
  { ID: 3, name: "Bob" }
];

var array2 = [
  { ID: 1, property: "value1" },
  { ID: 2, property: "value2" },
  { ID: 4, property: "value3" }
];

var merged = mergeArrays(array1, array2);
console.log(merged);