求最大值和最小值

1.求最大值

function max(a,b,c){
    var max = a;
    max < b && (max = b);
    max < c && (max = c);
    return max;
}
    var n = max (30,50,40);
    console.log(n);//n=50;
2.求最小值

function min(a,b,c){
    var min = a;
    min > b && (min = b);
    min > c && (min = c);
    return min;
}
    var n = min (30,50,40);
    console.log(n);//30;

3.数组中的最大值

function Arraymax(arr){
    var max=arr[0];
    for(var i=0;i<arr.length;i++){
        max<arr[i]&&(max=arr[i]);
    }
    return max;
}
    var arr=[1,4,5,2,3,-2];
    console.log(Arraymax(arr));//5