js最简单的数组去重方法

var arr = [
  {
    "id": "200910760094",
    "isState": true,
    "ruleType": 1
  },
  {
    "id": "200910760094",
    "isState": true,
    "ruleType": 2
  },
  {
    "id": "200910760094",
    "isState": true,
    "ruleType": 1
  },
  {
    "id": "200910760094",
    "isState": true,
    "ruleType": 1
  }
];

var result = [];
var obj = {};
for(var i =0; i<arr.length; i++){
  if(!obj[arr[i].ruleType]){
     result.push(arr[i]);
     obj[arr[i].ruleType] = true;
  }
}
console.log(result);