JS1k: The JavaScript code golfing competition

var d,e=window,f=[];function g(b){return Math.floor(Math.random()*(b-0)+0)}var h=[g(608),g(544)],j=9,k=0,o=592,m=0,n=9999;function p(b,l,c,r,s){a.beginPath();a.rect(b,l,c,r);a.fillStyle=s;a.fill()}function q(b,l,c){a.fillStyle="#fff";a.a(b,l,c)}a.a=a.fillText;a.canvas.width=a.canvas.height=640;e.onkeydown=function(b){32===b.keyCode&&f.push([k+16-3,o])};e.onmousemove=function(b){k=b.pageX;0>=k&&(k=0);608<=k&&(k=608)};p(0,0,640,640,"#987");q("GO",32,32);e.onclick=function(){this.onclick=null;d=e.setInterval(function(){a.clearRect(0,0,640,640);p(0,0,640,640,"#987");p(h[0],h[1],32,32,"#6"+j+j);for(var b=0;b<f.length;b++)if(f[b][1]-=2,0<=f[b][1]){var l=f[b][0]>h[0]-6&&f[b][0]<h[0]+32,c=h[0];f[b][1]<=h[1]+32&&l?(f.splice(b,1),0<j?(j--,c=5<=g(9)?c-48:c+48,0>c&&(c+=96),608<c&&(c-=96),h[0]=c):(m++,h=[g(608),g(544)],j=9),p(h[0],h[1],32,32,"#6"+j+j)):p(f[b][0],f[b][1],6,6,"#dd0")}else f.splice(b,1);p(k,o,32,32,"#dd0");n--;q("T: "+n/100,0,9);q("K: "+m,0,22);n||(e.clearInterval(d),q("HIT F5",320,320))},1)}

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

/* global a */
var M,
    W = window,
    S = 640, // window size
    s = 32, // size
    t = 22, // tempo
    B = [], // bullet
    k = 9, // bullet size
    r = function (i, j) { // generate random number in range i to j
        'use strict';

        return Math.floor((Math.random() * (j - i)) + i);
    },
    N = function () { // generate new enemy
        'use strict';

        return [r(0, S - s), r(0, S - (s * 3))];
    },
    E = N(), // Enemy
    l = 9, // Enemy life
    O = 0, // Player y
    o = S - (s * 1.5), // Player y
    K = 0, // KILLS
    T = 9999, // Time to count down
    d = function (x, y, w, h, c) { // draw rectangle
        'use strict';

        a.beginPath();
        a.rect(x, y, w, h);
        a.fillStyle = c;
        a.fill();
    },
    w = function (t, x, y) {
        'use strict';

        a.fillStyle = '#fff';
        a.t(t, x, y);
    };

a.t = a.fillText;
a.canvas.width = a.canvas.height = S;

// bindings
W.onkeydown = function (e) {
    'use strict';

    // fire, use var s, 'cause its - 1byte
    if (e.keyCode === s) {
        B.push([O + (s / 2) - (k / 2), o]);
    }
};

W.onmousemove = function (e) {
    'use strict';

    // player position
    O = e.pageX;

    // collision
    if (O <= 0) {
        O = 0;
    }

    if (O >= S - s) {
        O = S - s;
    }
};

// background
d(0, 0, S, S, '#987');
w('GO', s, s);

W.onclick = function () {
    'use strict';

    this.onclick = null;
    // main();
    M = W.setInterval(function () {
        a.clearRect(0, 0, S, S);
        // draw map
        d(0, 0, S, S, '#987');

        // enemy
        d(E[0], E[1], s, s, '#00' + l);

        // bullets
        for (var i = 0; i < B.length; i++) {
            B[i][1] -= 2;

             // if not end of the field
            if (B[i][1] >= 0) {
                var A = B[i][1] <= E[1] + s,
                    Z = B[i][0] > E[0] - k && B[i][0] < E[0] + s,
                    u = E[0],
                    m = s * 3;

                // enemy collision
                if (A && Z) {
                    B.splice(i, 1);
                    if (l > 0) {
                        l--;

                        if (r(0, 9) >= 5) {
                            u -= m;
                        } else {
                            u += m;
                        }

                        if (u < 0) {
                            u += m;
                        }

                        if (u > (S - s)) {
                            u -= m;
                        }

                        E[0] = u;
                    } else {
                        K++;
                        E = N();
                        l = 9;
                    }
                    d(E[0], E[1], s, s, '#00' + l);
                } else {
                    // draw bullet
                    d(B[i][0], B[i][1], k, k, '#cc3');
                }
            } else {
                B.splice(i, 1);
            }
        }

        // draw player
        d(O, o, s, s, '#ff0');

        // count time down
        T--;

        // draw infos
        w('T: ' + T/100, 0, 9);
        w('K: ' + K, 0, t);

        // if time is over
        if (!T) {
            W.clearInterval(M);

            w('HIT F5', S / 2, S / 2);
        }
    }, 1);
};