JS版连连看

对于练习JavaScript的同学来说，这个小练习项目是很有大帮助的，因为么有采用像JQuery、Vue等js库来编写，而是使用的元素js实现

这样对于加强js内功是有很大帮助的，

效果如下：

对于上示意图，点击相邻近的相同图片之后会自动消除

代码如下：(用到的图片素材下载地址：https://www.itprojects.cn/detail.html?example_id=4b6c44ca4a3f7fc439a3f30880b14cc6)

html

  1 <html>
  2     <head>
  3         <title>连连看 - it项目实例网 www.itprojects.cn</title>
  4     </head>
  5     <script src="link.js"></script>
  6     <body>
  7         <table cellpadding=0 cellspacing=0><tr><td><tbody style="background-color:black;" id="gamecanvas"></tbody></td></tr></table>
  8         <script>
  9             var width = 14;
 10             var height = 14;
 11             var eleWidth = 40;
 12             var eleHeight = 40;
 13             var gameEles = new Array();
 14             var linkStack = new Array();
 15             var lock = false;
 16             function createCanvas(_width,_height){
 17                 var gc = document.getElementById("gamecanvas");
 18                 var tempEles;
 19                 var tempEle;
 20                 var tempTr;
 21                 var tempTd;
 22                 for(var x = 0 ; x < _width ; x++){
 23                     tempEles = new Array();
 24                     tempTr = document.createElement("tr");
 25                     tempTr.style.height = eleHeight+"px";
 26                     for(var y = 0 ; y < _height ; y++){
 27                         tempEle = document.createElement("img");
 28                         tempEle.setAttribute("src","img/"+points[x][y].value+".jpg");
 29                         tempEle.setAttribute("id","ele"+x+"_"+y);
 30                         tempEle.style.width = eleWidth+"px";
 31                         tempEle.style.height = eleHeight+"px";
 32                         if(x>1 && x<_width-2 && y>1 && y<_height-2){
 33                             tempEle.onclick = eleChoose;
 34                         }
 35                         tempTd = document.createElement("td");
 36                         tempTd.style.width = eleWidth+"px";
 37                         tempTd.style.textAlign = "center";
 38                         tempTd.appendChild(tempEle);
 39                         tempTr.appendChild(tempTd);
 40                         gc.appendChild(tempTr);
 41                         tempEles[y] = tempEle;
 42                     }
 43                     gameEles[x] = tempEles;
 44                 }
 45             }
 46             function eleChoose(_event){
 47                 if(lock){
 48                     return;
 49                 }
 50                 lock = true;
 51                 var event;
 52                 var p;
 53                 var path;
 54                 if(window.event){
 55                     event = window.event;
 56                     p = getPoint(event.srcElement.getAttribute("id"));
 57                 }
 58                 else{
 59                     event = _event;
 60                     p = getPoint(event.target.getAttribute("id"));
 61                 }
 62                 if(linkStack.length == 0){
 63                     choose(p);
 64                     linkStack.push(p);
 65                 }
 66                 else{
 67                     if(p.x == linkStack[0].x && p.y == linkStack[0].y){
 68                         unchoose(linkStack.pop());
 69                         lock = false;
 70                         return;
 71                     }
 72                     choose(p);
 73                     if(p.value == linkStack[0].value){
 74                         path = linkPoints(linkStack[0],p);
 75                         if(path){
 76                             unchoose(linkStack.pop());
 77                             unchoose(p);
 78                             linkSus(path);
 79                         }
 80                         else{
 81                             path = linkPoints(p,linkStack[0]);
 82                             if(path){
 83                                 unchoose(linkStack.pop());
 84                                 unchoose(p);
 85                                 linkSus(path);
 86                             }
 87                             else{
 88                                 unchoose(linkStack.pop());
 89                                 linkStack.push(p);
 90                             }
 91                         }
 92                     }
 93                     else{
 94                         unchoose(linkStack.pop());
 95                         linkStack.push(p);
 96                     }
 97                 }
 98                 lock = false;
 99             }
100             
101             function choose(_point){
102                 var gameEle = gameEles[_point.x][_point.y];
103                 gameEle.style.width = eleWidth-2+"px";
104                 gameEle.style.height = eleHeight-2+"px";
105             }
106             
107             function unchoose(_point){
108                 var gameEle = gameEles[_point.x][_point.y];
109                 gameEle.style.width = eleWidth+"px";
110                 gameEle.style.height = eleHeight+"px";
111             }
112             
113             function linkSus(_path){
114                 var sourcePoint = _path.shift();
115                 var targetPoint = _path.pop();
116                 sourcePoint.value = 0;
117                 targetPoint.value = 0;
118                 var sourceEle = gameEles[sourcePoint.x][sourcePoint.y];
119                 var targetEle = gameEles[targetPoint.x][targetPoint.y];
120                 sourceEle.onclick=null;
121                 sourceEle.setAttribute("src","img/0.jpg");
122                 targetEle.onclick=null;
123                 targetEle.setAttribute("src","img/0.jpg");
124             }
125             
126             function getPoint(_id){
127                 var patterner = /ele(\d+)_(\d+)/;
128                 var result = _id.match(patterner);
129                 return points[result[1]][result[2]];
130             }
131             
132             createPoints(width,height);
133             createCanvas(width,height);
134         </script>
135     </body>
136 </html>

JS

  1 function _index(_value){
  2     for(var v in this){
  3         if(this[v] == _value){
  4             return new Number(v)
  5         }
  6     }
  7     return -1;
  8 }
  9 
 10 function _remove(_value){
 11     var _index = this.index(_value);
 12     this.splice(_index,1);
 13 }
 14 
 15 function _insert(_position,_value){
 16     this.splice(_position,0,_value);
 17 }
 18 
 19 Array.prototype.index = _index;
 20 Array.prototype.insert = _insert;
 21 Array.prototype.remove = _remove;
 22 
 23 function Point(_x,_y,_value){
 24     this.x = _x;
 25     this.y = _y;
 26     this.value = _value;
 27     this.directs = null;
 28     this.changed = 0;
 29 }
 30 
 31 function _createDirect(_pre,_target){
 32     this.directs = new Array();
 33     var stx = _target.x - this.x;
 34     var sty = _target.y - this.y;
 35     if(stx >= 0){
 36         this.directs.push("right");
 37         this.directs.push("left");
 38     }
 39     else{
 40         this.directs.push("left");
 41         this.directs.push("right");
 42     }
 43     if(sty >= 0){
 44         this.directs.insert(1,"up");
 45         this.directs.push("down");
 46     }
 47     else{
 48         this.directs.insert(1,"down");
 49         this.directs.push("up");
 50     }
 51     if (_pre == null){
 52         return ;
 53     }
 54     var spx = _pre.x - this.x;
 55     var spy = _pre.y - this.y;
 56     if (spx == 0){
 57         if (spy == 1){
 58             this.directs.remove("up");
 59         }
 60         else{
 61             this.directs.remove("down");
 62         }
 63     }
 64     else{
 65         if (spx == 1){
 66             this.directs.remove("right");
 67         }
 68         else{
 69             this.directs.remove("left");
 70         }
 71     }
 72 }
 73 
 74 function _forward(_pre,_target){
 75     if(this.directs == null){
 76         this.createDirect(_pre,_target);
 77     }
 78     if(this.directs.length == 0){
 79         return null;
 80     }
 81     var direct = null;
 82     var tmpDirect = null;
 83     var x = null;
 84     var y = null;
 85     var p = null;
 86     while(true){
 87         if(this.directs.length == 0){
 88             break;
 89         }
 90         tmpDirect = this.directs.shift();
 91         switch(tmpDirect){
 92             case "up":
 93                 x = this.x;
 94                 y = this.y + 1;
 95                 break;
 96             case "down":
 97                 x = this.x;
 98                 y = this.y - 1;
 99                 break;
100             case "left":
101                 x = this.x - 1;
102                 y = this.y;
103                 break;
104             case "right":
105                 x = this.x + 1;
106                 y = this.y;
107                 break;
108             default:
109                 throw new Error("error direct");
110                 break;
111         }
112         p = points[x][y];
113         if(p.value > 0 && p != _target){
114             continue;
115         }
116         else{
117             direct = tmpDirect;
118             if(_pre == null){
119                 this.changed = 1;
120             }
121             else{
122                 if((_pre.x - this.x) == 0 && (p.x - this.x) == 0){
123                     this.changed = 0;
124                 }
125                 else{
126                     if((_pre.y - this.y) == 0 && (p.y - this.y) == 0){
127                         this.changed = 0;
128                     }
129                     else{
130                         this.changed = 1;
131                     }
132                 }
133             }
134             break;
135         }
136     }
137     return direct;
138 }
139 
140 function _equals(_point){
141     if (_point == null){
142         return false;
143     }
144     if (this.x == _point.x && this.y == _point.y){
145         return true;
146     }
147     else{
148         return false;
149     }
150 }
151 
152 Point.prototype.createDirect = _createDirect;
153 Point.prototype.forward = _forward;
154 Point.prototype.equals = _equals;
155 
156 var points = new Array();
157 var valueStack = new Array();
158 
159 function createPoints(w,h){
160     var temp;
161     var tempValue;
162     pointStack(w,h);
163     for(var _x = 0 ; _x < w ; _x++){
164         temp = new Array();
165         for(var _y = 0 ; _y < h ; _y++){
166             if(_x == 0 || _x == (w-1) || _y == 0 || _y == (h-1)){
167                 tempValue = 9;
168             }
169             else{
170                 if(_x == 1 || _x == (w-2) || _y == 1 || _y == (h-2)){
171                     tempValue = 0;
172                 }
173                 else{
174                     tempValue = valueStack.pop();
175                 }
176             }
177             temp[_y] = new Point(_x,_y,tempValue);
178         }
179         points[_x] = temp;
180     }
181 }
182 
183 function pointStack(w,h){
184     var size = (w*h-(w*4+h*4-16))/2;
185     var pointValue;
186     for(var i = 0 ; i < size ; i++){
187         while(true){
188             pointValue = Math.floor(Math.random()*9);
189             if(pointValue != 0){
190                 break;
191             }
192         }
193         valueStack.insert(Math.floor(Math.random()*valueStack.length),pointValue);
194         valueStack.insert(Math.floor(Math.random()*valueStack.length),pointValue);
195     }
196 }
197 
198 function linkPoints(_source,_target){
199     var path = new Array();
200     var fail = new Object();
201     var change = 0;
202     var _current = _source;
203     var direct = null;
204     var _x,_y;
205     while(true){
206         //alert("current--"+pointStr(_current)+"change:"+change);
207         if(_current == _target && change < 4){
208             path.push(_target);
209             for(var p in path){
210                 path[p].directs = null;
211             }
212             return path;
213         }
214         if(change == 4){
215             _current.directs = null;
216             fail[(_current.x+"_"+_current.y)] = change;
217             _current = path.pop();
218             change = change - _current.changed;
219             continue;
220         }
221         if(_current == _source){
222             direct = _current.forward(null,_target);
223         }
224         else{
225             direct = _current.forward(path[path.length-1],_target);
226         }
227         if(direct != null){
228             if(direct == "up"){
229                 _x = _current.x;
230                 _y = _current.y + 1;
231             }
232             if(direct == "down"){
233                 _x = _current.x;
234                 _y = _current.y - 1;
235             }
236             if(direct == "left"){
237                 _x = _current.x - 1;
238                 _y = _current.y ;
239             }
240             if(direct == "right"){
241                 _x = _current.x + 1;
242                 _y = _current.y;
243             }
244             if(fail[(_x+"_"+_y)] != null){
245                 if (change >= fail[(_x+"_"+_y)]){
246                     continue;
247                 }
248                 else{
249                     delete fail[(_x+"_"+_y)];
250                 }
251             }
252             change = change + _current.changed;
253             path.push(_current);
254             _current = points[_x][_y];
255         }
256         else{
257             if(_current == _source){
258                 _source.directs = null;
259                 return false;
260             }
261             else{
262                 _current.directs = null;
263                 fail[(_current.x+"_"+_current.y)] = change;
264                 _current = path.pop();
265                 change = change - _current.changed;
266             }
267         }
268     }
269 }
270 
271 /*function pointStr(p){
272     return " x:"+p.x+" y:"+p.y+" value:"+p.value;
273 }
274 */
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原文地址：https://www.cnblogs.com/dong4716138/p/14498754.html