判断数组对象里的属性值是否重复

for (var i = 0; i < arr.length - 1; i++) {
            for (var j = i + 1; j < arr.length; j++) {
              if (arr[i].deptName === arr[j].deptName) {
                this.$showWarningMsg('事业部重名了，请重新输入')
                this.loading = false
                return false
              }
            }
          }