HTML5是一種新的Web技術(shù)，能夠使用各種新功能來創(chuàng)建游戲開發(fā)工具。使用HTML5，開發(fā)者可以在任何可運(yùn)行HTML5的設(shè)備上創(chuàng)建游戲，并將其作為網(wǎng)頁游戲來展示。現(xiàn)在，我們來看一下HTML5在線游戲交互代碼。

var canvas = document.getElementById("canvas");
var ctx = canvas.getContext("2d");
var width = canvas.width = window.innerWidth;
var height = canvas.height = window.innerHeight;
function random(min, max) {
return Math.floor(Math.random() * (max - min + 1)) + min;
}
function Ball(x, y, velX, velY, color, size) {
this.x = x;
this.y = y;
this.velX = velX;
this.velY = velY;
this.color = color;
this.size = size;
}
Ball.prototype.draw = function() {
ctx.beginPath();
ctx.fillStyle = this.color;
ctx.arc(this.x, this.y, this.size, 0, 2 * Math.PI);
ctx.fill();
};
Ball.prototype.update = function() {
if ((this.x + this.size) >= width) {
this.velX = -(this.velX);
}
if ((this.x - this.size)<= 0) {
this.velX = -(this.velX);
}
if ((this.y + this.size) >= height) {
this.velY = -(this.velY);
}
if ((this.y - this.size)<= 0) {
this.velY = -(this.velY);
}
this.x += this.velX;
this.y += this.velY;
};
Ball.prototype.collisionDetect = function() {
for (var j = 0; j< balls.length; j++) {
if (!(this === balls[j])) {
var dx = this.x - balls[j].x;
var dy = this.y - balls[j].y;
var distance = Math.sqrt(dx * dx + dy * dy);
if (distance< this.size + balls[j].size) {
balls[j].color = this.color = 'rgb(' + random(0, 255) + ',' + random(0, 255) + ',' + random(0, 255) + ')';
}
}
}
};
var balls = [];
while (balls.length< 25) {
var size = random(10,20);
var ball = new Ball(
random(0 + size,width - size),
random(0 + size,height - size),
random(-7,7),
random(-7,7),
'rgb(' + random(0,255) + ',' + random(0,255) + ',' + random(0,255) + ')',
size
);
balls.push(ball);
}
function loop() {
ctx.fillStyle = 'rgba(0, 0, 0, 0.25)';
ctx.fillRect(0, 0, width, height);
for (var i = 0; i< balls.length; i++) {
balls[i].draw();
balls[i].update();
balls[i].collisionDetect();
}
requestAnimationFrame(loop);
}
loop();

上面的代碼使用了HTML5 canvas、requestAnimationFrame和Ball對(duì)象。通過Ball對(duì)象，我們可以創(chuàng)建多個(gè)小球，并且讓這些小球具有運(yùn)動(dòng)和碰撞檢測(cè)功能。可以使用這些技術(shù)來創(chuàng)建2D動(dòng)畫，并與用戶進(jìn)行交互。這些全新的功能使HTML5成為開發(fā)者創(chuàng)建游戲的理想平臺(tái)。不僅如此，HTML5還可以輕松將游戲部署到Web上，讓人們可以在任何地方使用任何設(shè)備輕松暢享游戲體驗(yàn)。