js sort()

定义和用法

sort()用于对数组的元素进行排序

例子：

正序排列

<script>
	var arr=[1,5,3,4,6,7,1,9,5,3];
	var newarr=[];
	for(i=0;i<arr.length;i++){
		if(newarr.indexOf(arr[i])==-1){
			newarr.push(arr[i])
		}
	}
	newarr.sort();
	console.log(newarr)//[1, 3, 4, 5, 6, 7, 9]
</script>

倒序排列

<script>
	var arr=[1,5,3,4,6,7,1,9,5,3];
	var newarr=[];
	for(i=0;i<arr.length;i++){
		if(newarr.indexOf(arr[i])==-1){
			newarr.push(arr[i])
		}
	}
	newarr.sort(function pl(a,b){return b-a;});
	console.log(newarr)//[9, 7, 6, 5, 4, 3, 1]
</script>