数组去重js

                <!--方式一：索引方式-->
		<script>
			var arry = [1,2,4,6,78,4,2,1,3,7];
			var newArry = [];
			function aa(){
				for(var i=0;i<arry.length;i++){
					if(newArry.indexOf(arry[i])==-1){
						newArry.push(arry[i]);
					}
				}
				return newArry;
			}
			aa();
			console.log(newArry);
		</script>
		<!--方式二：排序方式-->
		<script>
			var arry = [1,2,4,6,78,4,2,1,3,7];
			var newArry = arry.sort();
			var res=[];
			function aa(){
				for(var i=0;i<newArry.length;i++){
				if(newArry[i]!==res[res.length-1]){
					res.push(newArry[i]);
					}
				}
				return res;
			}			
			aa()
			console.log(res);
		</script>