冒泡排序

var arr= [1,7,11,5,4,8];
	for (var i=0;i<arr.length;i++) {
		for (var j=i+1;j<arr.length;j++) {
			if(arr[i]>arr[j]){
				var a = arr[j];
				arr[j] = arr[i];
				arr[i] = a;
			}
		}
	}