方法一：es5冒泡排序法，去重arr

var arr = [{name: 'a',id: 1}, {name: 'a',id: 2}, {name: 'b',id: 3}, {name: 'c',id: 4},
      {name: 'c',id: 6}, {name: 'b',id: 6}, {name: 'd',id: 7}];

function deWeight() {
  for (var i = 0; i < arr.length - 1; i++) {
    for (var j = i + 1; j < arr.length; j++) {
      if (arr[i].name == arr[j].name) {
        arr.splice(j, 1);
        //因为数组长度减小1，所以直接 j++ 会漏掉一个元素，所以要 j--
        j--;
      }
    }
  }
  return arr;
}

var newArr = deWeight();
console.log('%c%s', 'color:red;', '方法一：es5,newArr', newArr);

方法二：es5新建数据双重循环，去重arr2

var arr2 = [{name: 'a',id: 1}, {name: 'a',id: 2}, {name: 'b',id: 3}, {name: 'c',id: 4},
      {name: 'c',id: 6}, {name: 'b',id: 6}, {name: 'd',id: 7}];
var temp = [];

function deWeightTwo() {
  arr2.forEach(function(a) {
    var check = temp.every(function(b) {
      return a.name !== b.name;
    })
    check ? temp.push(a) : ''
  })
  return temp;
}

var newArr2 = deWeightTwo();
console.log('%c%s', 'color:red;', '方法二：es5,newArr2', newArr2);

方法三：es6的Map()，去重arr3

// 
var arr3 = [{name: 'a',id: 1}, {name: 'a',id: 2}, {name: 'b',id: 3}, {name: 'c',id: 4},
            {name: 'c',id: 6}, {name: 'b',id: 6}, {name: 'd',id: 7}];

let deWeightThree = () => {
  let map = new Map();
  for (let item of arr3) {
    if (!map.has(item.name)) {
      map.set(item.name, item);
    }
  }
  return [...map.values()];
}

let newArr3 = deWeightThree();
console.log('%c%s', 'color:red;', '方法三：es6,newArr3', newArr3);

方法四：es5，对象法(reduce)，去重arr4

var arr4 = [{name: 'a',id: 1}, {name: 'a',id: 2}, {name: 'b',id: 3}, {name: 'c',id: 4},
      {name: 'c',id: 6}, {name: 'b',id: 6}, {name: 'd',id: 7}];
// array.reduce(function(total, currentValue, currentIndex, arr), initialValue)
// (function(必选初始值或计算结束返回值, 必选当前元素, 可选索引, 可选原数组),可选函数初始值)

var obj = {};
function deWeightFour() {
  arr4 = arr4.reduce(function(a, b) {
    obj[b.name] ? '' : obj[b.name] = true && a.push(b);
    return a;
  }, [])
  return arr4;
}

var newArr4 = deWeightFour();
console.log('%c%s', 'color:red;', '方法四：es5,newArr4', newArr4);