用js实现冒泡排序

var arr = [3,2,1,4,5,6,7];
            for(var i=0;i<arr.length-1;i++){
            for(var j=0;j<arr.length-1;j++){
                if(arr[j] > arr[j+1]){
                    var temp = arr[j];
                    arr[j] = arr[j+1];
                    arr[j+1] = temp;
                }
            }
        }
        console.log(arr);