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base-animation.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>fillRect</title>
<style>
</style>
</head>
<body>
<canvas id="canvas">
不支持canvas
</canvas>
<script>
var cc = document.getElementById("canvas");
var cxt = cc.getContext("2d");
var ca = document.createElement("canvas");
ca.width=500;
ca.height=500;
var cxt2 = ca.getContext("2d");
var x = y = 0;
//加载多个图片
function loadImages(sources, callback) {
var count = 0,
images = {},
imgNum = 0;
for (k in sources) {
imgNum++;
}
for (k in sources) {
images[k] = new Image();
images[k].onload = function() {
if (++count >= imgNum) {
callback(images);
}
}
images[k].src = sources[k];
}
}
var sources = [];
function drawimages() {
sources = ["images/0.png", "images/1.png", "images/2.png", "images/3.png", "images/4.png", "images/5.png", "images/2.png", "images/3.png", "images/4.png", "images/5.png"];
//调用图片预加载函数，实现回调函数
loadImages(sources, function(images) {
var x = y = 0;
for (var i = 0; i < sources.length; i++) {
cxt2.drawImage(images[i], x * 100, y * 100, 100, 100);
if (i < 4) {
x++;
} else if (i >= 4 && i < 8) {
y++;
} else if (i >= 8 && i < 12) {
x--;
} else {
y--;
}
}
});
}
drawimages();
var times = Math.floor(Math.random() * 10) + sources.length * 2;
var v = 0;
var timeId = '';
function move() {
var moveX = 400;
var speed = 100;
if (x < moveX && y == 0) {
x += speed;
} else if (x == moveX && y < moveX) {
y += speed;
} else if (y == moveX && x > 0) {
x -= speed;
} else if (x == 0 && y > 0) {
y -= speed;
}
cxt.clearRect(0, 0, 500, 500);
cxt.drawImage(ca,0,0,500,500);
cxt.fillStyle = "rgba(0,0,0,.5)";
cxt.fillRect(x, y, 100, 100);
if (v > times) {
cancelAnimationFrame(timeId);
}
v++;
timeId = requestAnimationFrame(move);
}
move();
</script>
</body>
</html>