js实现俄罗斯方块小游戏分享_javascript技巧



代码如下:

NEXT:

var map=eval("["+Array(23).join("0x801,")+"0xfff]");
var tatris=[[0x6600],[0x2222,0xf00],[0xc600,0x2640],[0x6c00,0x4620],[0x4460,0x2e0,0x6220,0x740],[0x2260,0xe20,0x6440,0x4700],[0x2620,0x720,0x2320,0x2700]];
var char={x:"\u3000",s:"\u25a0",t:"\u25a1"};
var keycom={"38":"rotate(1)","40":"down()","37":"move(2,1)","39":"move(0.5,-1)","32":"0;pause=!pause"};
var dia, pos, bak, run, next, pause=false, info={speed:1,lines:0,score:0};
function start(){
dia=next.d;
bak=pos={fk:[],y:0,x:4,s:next.s};
nextdia();
document.getElementById("next").innerHTML=(next.d[next.s%next.d.length]|0x10000).toString(2).slice(-16).replace(/..../g,"$&
").replace(/1/g,char.t).replace(/0/g,char.x);
document.getElementById("text").innerHTML="SCORE:"+info.score+"

LINES:"+info.lines+"

SPEED:"+info.speed;
rotate(0);
run=setInterval("pause||down()",~~(Math.pow(1.3,12-info.speed)*30+20));
}
function over(){
document.onkeydown=null;
alert("GAME OVER");
}
function nextdia(){
next={d:tatris[~~(Math.random()*7)],s:~~(Math.random()*4)};
}
function update(t){
bak={fk:pos.fk.slice(0),y:pos.y,x:pos.x,s:pos.s};
if(t) return;
for(var i=0,a2=""; i<22; i++)
a2+=map[i].toString(2).slice(1,-1)+"
";
for(var i=0,n; i<4; i++)
if(/([^0]+)/.test(bak.fk[i].toString(2).replace(/1/g,char.t)))
a2=a2.substr(0,n=(bak.y+i+1)*15-RegExp.$_.length-4)+RegExp.$1+a2.slice(n+RegExp.$1.length);
document.getElementById("box").innerHTML=a2.replace(/1/g,char.s).replace(/0/g,char.x);
}
function is(){
for(var i=0; i<4; i++)
if((pos.fk[i]&map[pos.y+i])!=0) return pos=bak;
}
function rotate(r){
var f=dia[pos.s=(pos.s+r)%dia.length];
for(var i=0; i<4; i++)
pos.fk[i]=(f>>(12-i*4)&15)< update(is());
}
function down(){
++pos.y;
if(is()){
for(var i=0, r=0; i<4 && pos.y+i<22; i++)
if((map[pos.y+i]|=pos.fk[i])==0xfff){
map.splice(pos.y+i,1), map.unshift(0x801);
++info.lines%20==0 && info.speed++, r++;
}
clearInterval(run);
if(map[1]!=0x801) return over();
info.score+=~~(Math.pow(r,1.5)*10)+2;
start();
}
update();
}
function move(t,k){
pos.x+=k;
for(var i=0; i<4; i++)
pos.fk[i]*=t;
update(is());
}
document.onkeydown=function(e){
eval("pause||"+keycom[(e?e:event).keyCode]);
};
nextdia();
start();