canvas猜数游戏

 <!DOCTYPE html>

 <html lang="en">

 <head>

 <meta charset="UTF-8">

 <title>猜数</title>

 </head>

 <body>

 <canvas id="box" width="500" height="300"></canvas>

 <form>

 <input type="text" id="guessValue" placeholder="port Canvas Image">

 <button id="createImageData">猜猜看?!</button>

 </form>

 <script>

 var guesses = 0;

 var message = "Guess the letter from a(lower) to Z(higher)";

 var letters = ["a","b","c","d","e","f","g","h","i","j","k","l","m","n","o","p","q","r","s","t","u","v","w","x","y","z"];

 var today = new Date();

 var letterToGuess = '';

 var higherOrLower='';

 var letterGuessed;

 var gameOver = false;

 function initGame() {

     var letterIndex = Math.floor(Math.random() * letters.length);

     letterToGuess = letters[letterIndex];

     guess = 0;

     letterGuessed = [];

     gameOver = false;

     window.addEventListener("keydown", eventKeyPressed, true);

     drawScreen();

     var formElement = document.querySelector("#createImageData");

     formElement.addEventListener("click",createImageDataPressed,false);

 }

 function eventKeyPressed(e){

     if(!gameOver) {

         var letterPressed = String.fromCharCode(e.keyCode);

         letterPressed = letterPressed.toLowerCase();

         guesses++;

         letterGuessed.push(letterPressed);

         if (letterPressed == letterToGuess) {

             gameOver = true;

         } else {

             letterIndex = letters.indexOf(letterToGuess);

             guessIndex = letters.indexOf(letterPressed);

             console.log(guessIndex);

             if (guessIndex < 0) {

                 higherOrLower = "That is not a letter!"

             } else if (guessIndex > letterIndex) {

                 higherOrLower = "Lower";

             } else {

                 higherOrLower = "higher";

             }

         }

          drawScreen();

     }

 }

 var canvas = document.querySelector("#box");

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

 function drawScreen(){

     //背景

     ctx.fillStyle = "#ffffaa";

     ctx.fillRect(0,0,500,300);

     //边框

     ctx.strokeStyle = "#000000";

     ctx.strokeRect(5,5,490,290);

     ctx.textBaseline = "top";

     //日期

     ctx.fillStyle = "#000000";

     ctx.font = "10px Sans-Serif";

     ctx.fillText(today,150,10);

     //消息

     ctx.fillStyle = "#ff0000";

     ctx.font = "14px Sans-serif";

     ctx.fillText(message,125,30);

     //猜的次数

     ctx.fillStyle = "#109910";

     ctx.font = "16px Sans-serif";

     ctx.fillText("guess: "+guesses+"次！",215,50);

     //显示higher或lower

     ctx.fillStyle = "#000";

     ctx.font = "16px Sans-Serif";

     ctx.fillText("Higher or Lower: "+higherOrLower,150,125);

     //猜过的字母

     ctx.fillStyle = "#ff0000";

     ctx.font = "16px Sans-Serif";

     ctx.fillText("Letters Guessed: "+letterGuessed.toString(),10,260);

     if(gameOver){

         ctx.fillStyle = "#ff0000";

         ctx.font = "40px _sans-serif";

         ctx.fillText("You got it!",150,180);

     }

 }

 function createImageDataPressed(e){

 window.open(canvas.toDataURL(),"canvasImage","left=0,top=0,width="+canvas.width +",height="+canvas.height +",toolbar=0,resizeable=0");

 }

 initGame();

 </script>

 </body>

 </html>
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canvas猜数游戏

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