javascript 数组排序（三种方法）

var arr1 = [20, 80, 54, 78, 8, 67, 27];
		function my(a,b){
			return a-b;
		}
		console.log(arr1.sort(my));//8,20,27,54,67,78,80

var arr1 = [20, 80, 54, 78, 8, 67, 27];
		function mys(arr1){
			for(var i=0;i<arr1.length-1;i++){
				for(var j=0;j<arr1.length-1-i;j++)
				{
					if(arr1[j]>=arr1[j+1]){
						var temp=arr1[j+1];
						arr1[j+1]=arr1[j];
						arr1[j]=temp;
					}
				};
			};
			return arr1;//返回到数组
		};
		console.log(mys(arr1));//8,20,27,54,67,78,80

var arr1 = [20, 80, 54, 78, 8, 67, 27];
			function my(arr1) {
				for (var i = 0; i < arr1.length - 1; i++) {
					for (var j = i + 1; j < arr1.length; j++) {
						if (arr1[i] > arr1[j]) {
							var temp = arr1[i];
							arr1[i] = arr1[j];
							arr1[j] = temp;
						};
					};
				};
				return arr1;//返回到数组
			};
			console.log(my(arr1));//8,20,27,54,67,78,80