html5掷骰子的小demo

时间：2022-06-29 15:03:01

代码如下：

 <!DOCTYPE>

 <html>

     <title>柯乐义</title>

     <head>

         <script>

             var leftX = 150;

             var topY = 100;

             var diceX = 80;

             var diceY = 80;

             var dotR = 4;

             var count = 0;

             var lastNum = 0;

             var flag = false;

             function clickMe() {

                 count = 0;

                 if(flag) {

                     return false;

                 }

                 flag = true;

                 var ctx = document.getElementById("canvas").getContext('2d');

                 ctx.beginPath();

                 //ctx.arc(100,100,50,0,Math.PI,false);

                 ctx.strokeRect(leftX,topY,diceX,diceY);

                setTimeout(function(){

                     random(ctx);

                },200);

             }

             function drawDice(ctx,randomNum) {

                 ctx.clearRect(leftX,topY,diceX,diceY);

                     switch(randomNum) {

                         case 1:

                             draw1();

                             break;

                         case 2:

                             draw2();

                             break;

                         case 3:

                             draw3();

                             break;

                         case 4:

                             draw4();

                             break;

                         case 5:

                             draw5();

                             break;

                         case 6:

                             draw6();

                             break;

                     }

                     count++;

                     if(count>=20) {

                         if(randomNum==6) {

                             alert("哇！你走*运啦，今天可以去买彩票啦");

                         } else if(randomNum <=3) {

                             alert("今天运气不太好哦！再试一把");

                         } else {

                             alert("请再接再厉，在来一把");

                         }

                         flag = false;

                         return false;

                     } else {

                         setTimeout(function(){

                             random(ctx);

                        },200-count);

                     }

             }

             function random(ctx) {

                 var randomNum = Math.floor(Math.random()*6)+1;

                 if(randomNum == lastNum) {

                     random(ctx)

                 } else {

                     lastNum = randomNum;

                     drawDice(ctx,randomNum);

                 }

             }

             function commonDraw(ctx,dotX,dotY) {

                 ctx.beginPath();

                 ctx.arc(dotX,dotY,dotR,0,2*Math.PI,false);

                 ctx.stroke();

                 ctx.fill();

             }

             function draw1() {

                 var ctx = document.getElementById("canvas").getContext('2d');

                 ctx.fillStyle="#0000ff";

                 var dotX = leftX+diceX/2;

                 var dotY = topY+diceY/2;

                 commonDraw(ctx,dotX,dotY);

             }

             function draw2() {

                 var ctx = document.getElementById("canvas").getContext('2d');

                 ctx.fillStyle="#99FF66";

                 var dotX = leftX+4*dotR;

                 var dotY = topY+4*dotR;

                 commonDraw(ctx,dotX,dotY);

                 var dotX = leftX+diceX-4*dotR;

                 var dotY = topY+diceY-4*dotR;

                 commonDraw(ctx,dotX,dotY);

             }

             function draw3() {

                 draw1();

                 draw2();

             }

             function draw4() {

                 draw2();

                 var ctx = document.getElementById("canvas").getContext('2d');

                 ctx.fillStyle="#99CC00";

                 var dotX = leftX+diceX-4*dotR;

                 var dotY = topY+4*dotR;

                 commonDraw(ctx,dotX,dotY);

                 var dotX = leftX+4*dotR;

                 var dotY = topY+diceY-4*dotR;

                 commonDraw(ctx,dotX,dotY);

             }

             function draw5(){

                 draw1();

                 draw4();

             }

             //http://www.cnblogs.com/sosoft/

             function draw6(){

                 var ctx = document.getElementById("canvas").getContext('2d');

                 ctx.fillStyle="#996633";

                 var dotX = leftX+4*dotR;

                 var dotY = topY+diceY/2

                 commonDraw(ctx,dotX,dotY);

                 var dotX = leftX+diceY-4*dotR;

                 commonDraw(ctx,dotX,dotY);

                 draw4();

             }

             function  init() {

                 var ctx = document.getElementById("canvas").getContext('2d');

                 ctx.beginPath();

                 ctx.strokeRect(leftX,topY,diceX,diceY);

                 ctx.stroke();

                 draw6();

             }

         </script>

     </head>

     <body onload="init();">

         <canvas id="canvas" width="400" height="300" style="background-color:#CCFFCC">

             your brower is not support html5

         </canvas>

         <input type="button" value="掷骰子" onclick="clickMe();"/>

     </body>

 </html>

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