<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html>
<style>
div {display:block;background-color:black;position:absolute;font:17px Tahoma;color:#fff;}
span {float:left;background-color:gray;width:12px;height:12px;border:4px gray outset;margin:0 1 1 0;overflow:hidden;}
p {float:left;width:8px;height:8px;border:2px gray outset;overflow:hidden;margin:0;padding:0}
#main {width:375px;height:430px;display:block;background-color:gray;position:relative;}
#body {width:241px;height:401px;left:15px;top:15px;border:1px solid #999;}
#score {width:80px;height:24px;left:270px;top:15px;padding:4px;}
#level {width:80px;height:24px;left:270px;top:50px;padding:4px;}
#next {width:50px;height:50px;left:270px;top:85px;border:19px black solid;}
#ctrl {width:80px;height:55px;left:270px;top:360px;padding:4px;text-align:center;background-color:gray}
#ctrl button{width:80px;height:25px;}
</style>
<script>
//http://www.codesky.net
var G = {
fs:[],
fn:[],
score:0,
l:['#9F0','#FF3','#F33','#C0C','#33C','#0F3','#F93'],
v:[0x801,0x801,0x801,0x801,0x801,0x801,0x801,0x801,0x801,0x801,0x801,0x801,0x801,0x801,0x801,0x801,0x801,0x801,0x801,0xFFFF],
d:[[0xCC00],[0x4444,0xF0],[0x8C40,0x6C00],[0x4C80,0xC600],[0x44C0,0x8E00,0xC880,0xE200],[0x88C0,0xE800,0xC440,0x2E00],[0x4E00,0x8C80,0xE400,0x4C40]],
init:function(){
var body = document.getElementById('body');
var next = document.getElementById('next');
for(var i=0;i<240;i++){
G.fs.push(body.appendChild(document.createElement("span")));
}
for(var i=0;i<16;i++){
G.fn.push(next.appendChild(document.createElement("p")));
}
G.domScore = document.getElementById('score');
G.domLevel = document.getElementById('level');
document.onkeydown=function(e){G.event(e||window.event,0)};
G.rand();
G.next();
},
timeTesk:function(){
if(G.pause)return;
if(!G.move(G.x, G.y+1, G.t)){
var s = 0;
for(var i=0;i<19;i++){
G.v[i]=G.v[i]|G.m[i];
if(G.v[i]==0xFFF){
for(var k=i;k>0;k--){
G.v[k] = G.v[k-1];
}
G.score+=++s;
}
}
G.next();
return false;
}
G.draw();
return true;
},
move:function(x,y,t){
var m = [];
for(var k=0;k<4;k++){
//下面的这段代码也看不懂，请详细解答一下。
m[y+k] = (G.d[G.n][t]>>(3-k)*4&0xF)<<Math.max(x,0)>>-Math.min(x,0);
if(m[y+k] & G.v[y+k]){
return false;
}
}
G.x = x;
G.y = y;
G.t = t;
G.m = m;
G.draw();
return true;
},
rand:function(){
G.n = G._n;
G.t = G._t;
G.c = G._c;
G._n = parseInt(Math.random()*G.d.length);
G._t = parseInt(Math.random()*G.d[G._n].length);
G._c = parseInt(Math.random()*G.l.length);
},
next:function(){
G.rand();
if(parseInt(G.score/20)!=G.level){
G.level = parseInt(G.score/20);
clearInterval(G.handle);
G.handle = setInterval("G.timeTesk()",500/(G.level+1));
}
G.domScore.innerHTML = 'Score:'+G.score;
G.domLevel.innerHTML = 'Level:'+G.level;
var i = 0;
while(!(G.d[G.n][G.t]>>i*4&0xF))i++;
if(!G.move(3, i-3, G.t)){
alert('Game over!');
clearInterval(G.handle);
}
},
draw:function(){
for(var i=0;i<240;i++){
if((G.v[parseInt(i/12)]>>(11-i%12))&0x1){
G.fs[i].style.visibility = '';
}else if((G.m[parseInt(i/12)]>>(11-i%12))&0x1){
G.fs[i].style.visibility = '';
G.fs[i].style.borderColor = G.fs[i].style.background = G.l[G.c];
}else{
G.fs[i].style.visibility ='hidden';
}
}
for(var i=0;i<16;i++){
if(G.d[G._n][G._t]>>(15-i)&0x1){
G.fn[i].style.visibility = '';
G.fn[i].style.borderColor = G.fn[i].style.background = G.l[G._c];
}else{
G.fn[i].style.visibility ='hidden';
}
}
},
event:function(e,t){
switch(e.keyCode){
case 37:
G.move(G.x + 1, G.y, G.t);
break;
case 39:
G.move(G.x - 1, G.y, G.t);
break;
case 38:
G.move(G.x, G.y, (G.t + 1) % G.d[G.n].length);
break;
case 40:
G.timeTesk();
break;
case 32:
while(G.timeTesk());
}
}
}
</script>
<body onload='G.init();'>
<div id='main'>
<div id='body'></div>
<div id='score'></div>
<div id='level'></div>
<div id='next'></div>
<div id='ctrl'>
<button onclick="javascript:location.href=location.href;">New</button>
//这下面的代码看不懂啊
//[G.pause=!!!G.pause]和[G.pause=!G.pause]有去区别吗？？
//有，那有什么区别，请详细讲讲。
<button onclick="javascript:this.innerHTML={'true':'Start','false':'Pause'}[G.pause=!!!G.pause];">Pause</button>
</div>
</GMain>
</body>
</html>
上面我注视的地方是我看不懂的地方，请帮帮我看看，如果知道麻烦给详细讲解一下，谢谢。
