标签:arch html doctype and sch arc back context style
参考:
1、http://www.w3school.com.cn/tags/canvas_filltext.asp
2、产生随机数:http://www.cnblogs.com/banbu/archive/2012/07/25/2607880.html
效果图:

思路:
1、创建一个画布。(背景为黑色)
2、绘制1个“星星”,设法变成n个。
3、把画布放入HTML页面中。
代码:
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8"/>
<title></title>
<style type="text/css">
canvas {
background-color: black;
}
</style>
</head>
<body>
<canvas id="myCanvas" width="1024" height="768" style="border:1px solid #d3d3d3;">
</canvas>
<script>
var c = document.getElementById("myCanvas");
var ctx = c.getContext("2d");
ctx.font = "30px Verdana";
// Create gradient
var gradient = ctx.createLinearGradient(0, 0, c.width, 0);
gradient.addColorStop("0", "magenta");
gradient.addColorStop("0.5", "blue");
gradient.addColorStop("1.0", "red");
// Fill with gradient
ctx.fillStyle = gradient;
for (i = 1; i < 300; ++i) {
ctx.fillText("*", Math.random()*1024, Math.random()*768);
}
</script>
</body>
</html>
重用w3school代码。
标签:arch html doctype and sch arc back context style
原文地址:http://www.cnblogs.com/xkxf/p/6746148.html