javascsript 去除数组重复数据

function uniqid(arr){
var newArr = [];
var c;
for(var i = 0 ;i <= arr.length ;i++){
c = false;
for(var j = 0 ;j <= newArr.length ;j++){
if(arr[i] == newArr[j]){
c = true;
break;
}
}
if(!c){
newArr.push(arr[i]);
}
}
return newArr;
}
var arr1 = [1,2,3,2];
var b =uniqid(arr1);
console.log(b);