javascript - the code inside these functions

Question

As a newbie, please explain the code in the function. Thank you. Thank you

    var guojing=new Object();
        guojing.name="郭靖"
        guojing.HP=500;
        guojing.gj=90;
        guojing.sd=60;
        guojing.skill=new Array('亢龙有悔','飞龙在天','见龙在田','鸿渐于陆','潜龙勿用')

    var ouyang=new Object();
        ouyang.name='欧阳锋';
        ouyang.HP=800;
        ouyang.gj=100;
        ouyang.sd=40;
        ouyang.skill=new Array('灵蛇棍法','凤凰神力','颠倒阴阳','逆转静脉','天蟾神功')

    function whoGjwho(a,b){
          return a.sd*Math.random()>b.sd*Math.random()?[a,b]:[b,a]
      }

      

      function game(){
          var skillIndex=Math.floor(Math.random()*5)
          var Fight=whoGjwho(guojing,ouyang);
          var attacker=Fight[0]   这里为什么变成数组了呢？ 这里有点模糊不太明白
        var defender=Fight[1]
        var damage=attacker.gj*Math.random()-defender.gj*Math.random();
            if(damage<=0){
                    damage=0
                }else{
                    damage=Math.ceil(damage);
                }
        defender.HP-=damage;

        document.write(attacker.name+"使用了一招"+attacker.skill[skillIndex]+'<br>')
        document.write(defender.name+"损失了"+damage+'点HP'+'<br>')

        if (defender.HP>0) {
            document.write(defender.name+"的HP:"+defender.HP+'<br>'+attacker.name+'的HP:'+attacker.HP+'<hr>')    
        }else{
            document.write(defender.name+'战败了'+'<br>'+attacker.name+'取得了胜利！'+'<br>')
            alert(attacker.name+'取得了胜利！'+'Gmame Over!')
            clearInterval(zd)
        }

      }
  var zd=setInterval('game()',50)

Answer 1

function whoGjwho(a,b){
    return a.sd*Math.random()>b.sd*Math.random()?[a,b]:[b,a]
}    

The return value of this function is an array, [a, b] or [b, a]. So:

var Fight=whoGjwho(guojing,ouyang);
var attacker=Fight[0] 

Fight is an array.

Answer 2

The whoGjwho function returns an array. Don’t you understand the ternary operator?

Answer 3

Whether [a,b] or [b,a] is returned, it is an array