从0开始复习JS---1、函数复习

function get_order(array){
            for(var i = 0; i <array.length-1; i++){
                for(var j = 0; j < array.length - 1 -i; j++){
                    if(array[j] < array[j+1]){
                        var tem = array[j];
                        array[j] = array[j+1];
                        array[j+1] = tem;
                    }
                }
            }
            return array;
        }
        console.log(get_order([5,7,10,2,15,1,91]));

function max(a,b){
            return a > b ? a : b;
        }
        var a = prompt('请输入第1个数')-0;
        var b = prompt('请输入第2个数')-0;
        alert(max(a,b));

function get_year(year){
            if(year % 4 == 0 && year % 100 != 0 || year % 100 == 0){
                return true;
            }else {
                return false;
            }
        }
        var year = prompt('输入年份');
        if(Number(get_year(year)) == 1){
            alert('闰年');
        }else{
            alert('不是闰年');
        }

function get_day(year,month,day){
            var sum1=0,sum2=0;sum3=0,sum=0;
            for(var i = 1; i < month; i++){
                if(i == 1 || i == 3 || i == 5 || i == 7 || i == 8 || i == 10 || i == 12) {
                    sum1 = sum1 + 31;
                }else if (i == 4 || i == 6 || i == 9 || i == 11) {
                    sum2 = sum2 + 30;
                }else {
                    sum3 = 28;
                }
            }
            sum = sum1 + sum3 + sum2 + day;

            if((year % 4 == 0 && year % 100 != 0 || year % 100 == 0) && month >= 2){
                sum += 1;
            }
            return sum;
        }
        var year = prompt('请输入年份')-0;
        var month = prompt('请输入月份')-0;
        var day = prompt('请输入日期')-0;
        alert("您输入的日期是第：" + get_day(year,month,day) + '天');