<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>背景</title>
<style>
body,
html {
background-color: #bfa;
overflow: hidden;
}
canvas {
margin: 150px auto;
border: 1px solid black;
display: block;
background-color: white;
}
</style>
</head>
<body>
<canvas id="test" width="400" height="400">
<span>您的浏览器版本过低,请更换IE-9以上,或使用chrome等其他浏览器</span>
</canvas>
<script type="text/javascript">
window.onload = function () {
/** @type {HTMLCanvasElement} */
var flag = 0;
var scale = 0;
var flagScale = 0;
//1.获取画布
var canvas = document.querySelector('#test');
if (canvas.getContext) {
//2.获取画笔
var ctx = canvas.getContext('2d');
/*
在canvas中设置背景(需要image对象)
1. createPattern(image,repetition)
image：图像源
repetition:'repeat','repeat-x','repeat-y','no-repeat'
!!! 一般情况下,我们都会将createPattern返回的对象作为fillStyle的值
*/
var img = new Image();
img.src = './bg.png';
img.onload = function(){
draw();
}
function draw(){
var pattern = ctx.createPattern(img,'no-repeat');
ctx.fillStyle = pattern;
ctx.fillRect(0,0,400,400)
}
}
}
</script>
</body>
</html>