【数组】将数组中的重复对象去掉

// 数组去重方法
deleteObj (obj) {
  const uniques = [];
  const stringify = {};
  for (let i = 0; i < obj.length; i++) {
    const keys = Object.keys(obj[i]);
    keys.sort(function(a, b) {
      return (Number(a) - Number(b));
    });
    let str = '';
    for (let j = 0; j < keys.length; j++) {
      str += JSON.stringify(keys[j]);
      str += JSON.stringify(obj[i][keys[j]]);
    }
    if (!stringify.hasOwnProperty(str)) {
      uniques.push(obj[i]);
      stringify[str] = true;
    }
  }
  return uniques
},
// 执行

vm.areaOptions = vm.deleteObj(arr)