单纵就是干

battle.js

/* player defination ... */
var Players = {
    Sunyanzi  : { HP:100, ATT:20, DEF:5 },
    ikaros    : { HP:100, ATT:15, DEF:5 }
};

/* initialize battle field ... */
var queue = [];

/* decide fighting order ... */
for ( name in Players ) 
    Math.random() < 0.5 ? queue.push( name ) : queue.unshift( name );

/* so who will take first blood ..? */
var attacker = queue.shift();

/* battle roar ... */
console.log( attacker + "开始了战斗！" );

/* it is a good day to die ... */
try { 

    /* just one player ..? */
    if ( ! queue.length ) 
        throw new message( attacker + "揍了自己一顿，感觉十分开心。" );

    /* fight until die ... */
    while ( 1 ) {

        /* pick defender ... */
        var defender = queue.shift();

        /* calculate damage ... */
        var damage = parseInt( Math.random() * ( Players[attacker].ATT - Players[defender].DEF ) );

        /* settle ... */
        Players[defender].HP -= damage;

        /* print battle log ... */
        if ( damage > Players[defender].DEF * 2 )
            console.log( attacker + "的会心一击，" + defender + "受到" + damage + "点伤害！" );
        else if ( 0 == damage )
            console.log( attacker + "的攻击，但并没有命中" + defender + "。" );
        else 
            console.log( attacker + "的攻击，" + defender + "受到" + damage + "点伤害。" );

        /* enemy down ..? */
        if ( Players[defender].HP < 1 )

            /* is there another enemy ..? */
            if ( queue.length ) {

                /* battle log ... */
                console.log( attacker + "将" + defender + "击倒！" );

                /* get new defender ... */
                defender = queue.shift();

            /* victory ... */
            } else throw new message( attacker + "英勇的胜利！" );

        /* have a rest ... */
        queue.push( attacker );

        /* start a new round ... */
        attacker = defender;

    } 

} catch ( e ) {

    /* ending message ... */
    console.log( e.text );

}

/* object of end battle message ... */
function message( text ) { this.text = text; }