js実現のじゃんけんゲーム

最近jsを学んで、1つのじゃんけんの小さいゲームを実现して、分かち合います

 
 
 


    
 
    
        //       
        a='✊',b='✌️',c='?';
        document.write('0:✊ 1:✌️ 2:?<br>')
        var player,computer;
        computer=parseInt((Math.random()*10))%3;
        player=parseInt(window.prompt('     (0:✊ 1:✌️ 2:?):'));
        if(player==0||player==1||player==2){

            switch (player){
                case 0: player=a;break;
                case 1: player=b;break;
                case 2: player=c;break;
                default: player=-99;
            };

            switch (computer){
                case 0: computer=a;break;
                case 1: computer=b;break;
                case 2: computer=c;break;
                default: computer=-99;
            }

            document.write('   ',player,',     ',computer);
            if(player==computer){
                document.write(',     ')
            }else if(
                (player==a&&computer==b)||
                (player==b&&computer==c)||
                (player==c&&computer==a)
            ){
                document.write(',     ，   ψ(｀∇´)ψ')
            }else{
                document.write(',     ╥﹏╥...')
            }
        }else{
            document.write('  ,          ,    ...')
        }