HTML5的水果忍者游戲是一款十分流行的游戲，它的代碼也是值得學習的。下面，我們來一步步的分析這個游戲的代碼。
首先，我們需要在HTML文檔的頭部引入相關的CSS和JavaScript文件。
<head> <link rel="stylesheet" href="style.css"> <script src="jquery.min.js"></script> <script src="jquery-ui.min.js"></script> <script src="jquery.ui.touch-punch.min.js"></script> <script src="main.js"></script> </head>其次，我們需要建立一個游戲畫布，并定義它的樣式和事件。
<canvas id="canvas" width="480" height="320"></canvas>
<style>
#canvas {
border: 1px solid black;
}
</style>
<script>
var canvas, ctx;
$(document).ready(function() {
canvas = document.getElementById("canvas");
ctx = canvas.getContext("2d");
canvas.addEventListener("touchstart", function(event) {
event.preventDefault();
onTouchStart(event);
}, false);
canvas.addEventListener("touchmove", function(event) {
event.preventDefault();
onTouchMove(event);
}, false);
canvas.addEventListener("touchend", function(event) {
event.preventDefault();
onTouchEnd(event);
}, false);
canvas.addEventListener("mousedown", onMouseDown, false);
canvas.addEventListener("mousemove", onMouseMove, false);
canvas.addEventListener("mouseup", onMouseUp, false);
});
</script>接著，我們需要定義游戲元素的類，在這里分別是水果、炸彈和刀光。<script>
function Fruit(type, x, y, velocity) {
this.type = type;
this.x = x;
this.y = y;
this.velocity = velocity;
this.draw = function(ctx) {
ctx.drawImage(this.type.image, this.x, this.y);
}
}
function Bomb(x, y, velocity) {
this.x = x;
this.y = y;
this.velocity = velocity;
this.draw = function(ctx) {
ctx.drawImage(bombImage, this.x, this.y);
}
}
function Slash(x, y, angle, length) {
this.x = x;
this.y = y;
this.angle = angle;
this.length = length;
this.draw = function(ctx) {
ctx.strokeStyle = "white";
ctx.lineWidth = 5;
ctx.beginPath();
ctx.moveTo(this.x, this.y);
ctx.lineTo(this.x + this.length * Math.cos(this.angle), this.y + this.length * Math.sin(this.angle));
ctx.stroke();
}
}
</script>最后，我們需要定義游戲的主函數，并在其中定義游戲的循環以及每一幀的處理。<script>
function main() {
var fruits = [];
var bombs = [];
var slashes = [];
var score = 0;
var highScore = parseInt(localStorage.getItem("score")) || 0;
setInterval(function() {
ctx.clearRect(0, 0, canvas.width, canvas.height);
updateFruits(fruits, bombs, slashes);
updateBombs(bombs);
updateSlashes(slashes);
drawFruits(fruits);
drawBombs(bombs);
drawSlashes(slashes);
drawScore(score, highScore);
}, 1000 / 60);
setInterval(function() {
addFruit(fruits);
}, 1000);
setInterval(function() {
addBomb(bombs);
}, 5000);
$(document).keydown(function(event) {
if(event.which == 32) {
addSlash(slashes);
}
});
$("#canvas").swipe({
swipe: function(event, direction, distance) {
addSlash(slashes);
}
});
}
$(document).ready(function() {
main();
});
</script>以上就是HTML5水果忍者游戲的代碼詳解。通過這個例子，我們可以學習到很多關于HTML5游戲開發的知識，如動畫、事件處理和移動端適配等。希望大家可以通過這個例子掌握更多的前端開發技巧。上一篇html5水墨畫代碼
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