数组去重以及数组对象中多属性判断去重

##数组中值为number，string，boolean时：

	var data=[1,2,3,2,5,1];

1.ES6 Set

	function unique(arr){
	      let newArr=new Set(data);
	      let result=[...newArr];
	      return result;
	}
	console.log(unique(data));//[1, 2, 3, 5]

2.两层for

	function unique(arr){
	      	var re = [array[0]];
            for (var i = 1; i < array.length; i++) {
                  var isunique = true;
                  for (var r = 0; r < re.length; r++) {
                        if (re[r] === array[i]) {
                              isunique = false;
                        }
                  }
                  if (isunique) {
                        re.push(array[i]);
                  }
            }
            return re;
	}
	console.log(unique(data));//[1, 2, 3, 5]

3.利用对象属性是否存在

	function unique(arr){
	      	var re = [];
            var obj={};
            for (var i = 0; i < arr.length; i++) {
                   if(!obj.hasOwnProperty(arr[i])){
                         re.push(arr[i]);
                         obj[arr[i]]=true;
                   }
            }
            return re;
	}
	console.log(unique(data));//[1, 2, 3, 5]

##数组中值为对象时,并且两个属性结合判断，如下：name和age都相等时，判断为重复：

var data = [{name: "a", age: 20, count: 5},
            {name: "b", age: 21, count: 8},
            {name: "a", age: 20, count: 9}
];

1.对象属性

      var result = [];
            var obj = {};
            for(var i =0; i<arr.length; i++){
                  if(!obj[arr[i][name1]+"|"+arr[i][name2]]){
                        result.push(arr[i]);
                        obj[arr[i][name1]+"|"+arr[i][name2]] = true;
                  }
            }
            return result;

2.双for

var re = [array[0]];
for (var i = 1; i < array.length; i++) {
	var isunique = true;
	for (var r = 0; r < re.length; r++) {
       		if (re[r].name === array[i].name&&re[r].age === array[i].age) {
              		isunique = false;
       		}
	}
    if (isunique) {
            re.push(array[i]);
    }

}
return re;

3.reduce

function arrayUnique2(arr, name1,name2) {
     var obj = {};
     return arr.reduce(function (item, next) {
          if(!obj[arr[i][name1]+"|"+arr[i][name2]]){
                 item.push(arr[i]);
                 obj[arr[i][name1]+"|"+arr[i][name2]] = true;
          }
          return item;
     }, []);
}
console.log(arrayUnique2(data, "name","age"));