It has no technical content, it is just used to practice code logic. In order to have a clear code structure, I wrote the logic control part in global variables, and the user interface operations were encapsulated in UI objects, which was probably the case. For reference only. When I was working, some people complained that my coding style was too messy, so I wanted to try to write something that wasn't that messy. .
The code copy is as follows:
<HTML>
<head>
<title>2048 DEMO</title>
<meta charset='utf-8' />
<!--
708616 javascript present
http://treemonster.sinaapp.com
-->
<head>
<div id='box'>
MSIE is SB
<script>
//Global method is used for logical control
function x4(n){
var t=[];
while(n-->0)t.push([]);
return t;
}
function xx(f){
for(var i=0;i<UI.nw;i++){
for(var j=0;j<UI.nw;j++){
f(i,j);
}
}
}
function make(n){
return {
number:n,
moveStep:0,
newNumber:n,
needKill:0
};
}
function tran(_arr,md){
var undo=x4(UI.nw);
var out=x4(UI.nw);
var ud=UI.undo;
if(ud.push(undo)>32)ud.shift();
for(var i=0;i<UI.nw;i++){
var t=[],o=md%2^1;
for(var k=0;k<UI.nw;k++){
undo[i][k]=_arr[i][k].number;
if(md<3)t.push(_arr[i][k]);else t.push(_arr[k][i]);
}
o && t.reverse();
t=trans(t);
if(o)t[0].reverse(),t[1].reverse();
for(var j=0;j<UI.nw;j++){
var x=i,y=j;
if(md>2)x=j,y=i;
_arr[x][y]=t[0][j];
out[x][y]=t[1][j];
}
}
return [_arr,out];
}
function trans(arr){
for(var i=0,m=0;i<UI.nw;i++){
if(arr[i].number===0)m++;else arr[i].moveStep+=m;
var _i=arr[i];
for(var j=i-1;j>=0;j--){
if(!arr[j].number)continue;
if(arr[j].needKill)break;
if(arr[j].number==_i.number){
arr[j].needKill=1;
arr[i].newNumber*=2;
arr[i].moveStep++;
m++;
}
}
}
var out=[];
for(var i=UI.nw;i--;){
!arr[i].needKill && arr[i].number && out.unshift(arr[i].newNumber);
}
while(out.length<UI.nw)out.push(0);
return [arr,out];
}
//The interface operation starts, and the parameters of the interface operation are obtained through a global method
function $(a){return document.getElementById(a);}
UI={};
UI.update=function(d){
if(UI.locked)return;
var map=this.map;
var n=this.times;
UI.locked=1;//Stop user action before the animation is completed
var out=tran(map,d)[1];
var _n=0,_begin=x4(UI.nw);
(function(){
if(_n>n){
var _q=0;
xx(function(i,j){
_q=_q||this.map[i][j].moveStep;
var o=$('i'+i+'j'+j);
o.innerHTML=out[i][j]||'';
o.className='x r'+o.innerText;
this.map[i][j]=make(out[i][j]);
o=o.style;
o.display='block';
o.left=UI.size*j+"px";
o.top=UI.size*i+"px";
});
return _q ? UI.addNew():(UI.locked=0);
}
xx(function(i,j){
var o=$('i'+i+'j'+j),t,o1=o.style,s=d<3?'left':'top';
if(t=map[i][j][_n==n?'newNumber':'number'])o.innerHTML=t;else o1.display='none';
if(_begin[i][j]===undefined)_begin[i][j]=parseInt(o1[s]);
o1[s]=(_begin[i][j]+(map[i][j].moveStep*100/n*_n)*Math.pow(-1,d))+'px';
});
_n++;
setTimeout(arguments.callee,10);
})();
}
UI.undo=[];
UI.addNew=function(_q){
UI.locked=1;
var r=[];
xx(function(i,j){
this.map[i][j].number || r.push([i,j]);
});
if(!r.length)return UI.locked=0;
var q=new Date%r.length;q=r[q];
var b=$('i'+q[0]+'j'+q[1]);
var m=this.map[q[0]][q[1]];
b.innerHTML=m.number=m.newNumber=2<<new Date%2;
b.className='x r'+b.innerText;
var o=0,q=5;
(function(){
if(o<100)setTimeout(arguments.callee,10);
b.style.opacity=Math.min(o+=q++,100)/100;
})();
UI.locked=0;//Unlock
};
//create
UI.init=function(nw,maxUndo,size,times){
UI.times=times||8;//Number of animation overdue times
UI.nw=nw||5;//The side length of the square matrix
UI.map=map=x4(UI.nw);//Create a digital block object
UI.size=size||100;//cell width
UI.maxUndo=maxUndo||5;//Maximum number of undo steps
$('box').innerHTML='';
xx(function(i,j){
map[i][j]=make(0);
document.write("<div class='x' id='i"+i+"j"+j+"'/
style='left:"+(UI.size*j)+"px;top:"+(UI.size*i)+"px;'></div>/
<div class='y' /
style='left:"+(UI.size*j)+"px;top:"+(UI.size*i)+"px;'></div>");
});
UI.addNew();
UI.addNew();
};
UI.init(6,3,100,20);
//Auto play, only for demonstration. No event binding
setInterval(function(){UI.update([1,2,3,4][Math.random()*4|0]);},200);
</script>
</div>
<style>
#box{position:absolute;left:50%;top:50%;margin-left:-300px;margin-top:-300px;}
.x,.y{background:#ddd;position:absolute;width:80px;height:80px;font-size:30px;text-align:center;line-height:80px;font-weight:700;font-family:arial;z-index:1;}
.x{z-index:30;}
.r2{background: #eee4da;}
.r4{background: #ede0c8;}
.r8{color: #f9f6f2;background: #f2b179;}
.r16{ color: #f9f6f2;
background: #f59563; }
.r32{color: #f9f6f2;
background: #f67c5f; }
.r64{ color: #f9f6f2;
background: #f65e3b; }
.r128{ color: #f9f6f2;
background: #edcf72;}
.r256{ color: #f9f6f2;
background: #edcc61;}
.r512{ color: #f9f6f2;
background: #edc850;}
.r1024{ color: #f9f6f2;
background: #edc53f;}
.r2048{ color: #f9f6f2;
background: #edc22e;}
</style>
The above is all the content described in this article, I hope you like it.