简单数组去重

原生js简单数组去重

<script type="text/javascript">
			var a = ['1','2','3','a','1','a','3','4',2]
			var arr1 = [];
			
			$(a);
			function $(arr){
				for( var i = 0;i<arr.length;i++){
					if(arr.indexOf(arr[i])==i){
						arr1.push(arr[i]);
					}
				}
			alert(arr1);
			}	
</script>