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);