如何将对象数组合并为一个数组，然后过滤掉重复的对象

function mergeAndFilterObjects(arr) {
  var mergedArr = [];
  
  arr.forEach(function(obj) {
    var isUnique = true;
    
    // 检查该对象是否已存在于新数组中
    mergedArr.forEach(function(item) {
      if (item.id === obj.id) {  // 假设对象有一个唯一的ID属性
        isUnique = false;
      }
    });
    
    // 如果对象不存在于新数组中，则将其添加到新数组中
    if (isUnique) {
      mergedArr.push(obj);
    }
  });
  
  return mergedArr;
}

// 示例用法
var arr1 = [{id: 1, name: "A"}, {id: 2, name: "B"}, {id: 3, name: "C"}];
var arr2 = [{id: 2, name: "B"}, {id: 3, name: "C"}, {id: 4, name: "D"}];

var mergedAndFiltered = mergeAndFilterObjects(arr1.concat(arr2));
console.log(mergedAndFiltered);