Math.max():查詢最大值

var myArray1 = [1, 5, 6, 2, 3];
var max1 = Math.max(...myArray1);
console.log('max1',max1)
//"max1" 6

function MyMax(myarr){
    var al = myarr.length;
    maximum = myarr[al-1];
    while (al--){
        if(myarr[al] > maximum){
            maximum = myarr[al]
        }
    }
    return maximum;
};

var myArray2 = [1, 5, 8, 2, 3];
var max2 = MyMax(myArray2);
console.log('max2',max2)
//"max2" 8