HTML5画渐变背景图片并自动下载实现步骤
HTML5画渐变背景图片并自动下载实现步骤
发布时间:2016-12-27 来源:查字典编辑
摘要:drawBgLine.htmlhtml5画渐变背景图片,并自动下载//第一步:获取canvas对象varc=document.getElem...

drawBgLine.html

<!DOCTYPE html>

<head>

<meta charset="UTF-8"/>

<title>html5画渐变背景图片,并自动下载</title>

</head>

<body>

<center>

<canvas id="c" width="1" height="200" ></canvas>

</center>

<script>

//第一步:获取canvas对象

var c = document.getElementById("c");

//第二步:获取canvas对象的上下文对象

var context = c.getContext("2d");

/*

* 这些是画其他图形代码

context.beginPath();

context.lineWidth=10;

context.strokeStyle="red";

context.moveTo(50,50);

context.lineTo(150,50);

context.stroke();

context.closePath();

//context.strokeRect(220,50,50,50);

context.fillStyle="blue";

context.fillRect(220,50,50,50);

context.beginPath();

context.arc(150,150,50,0*Math.PI/180,-180*Math.PI/180,false);

context.lineTo(150,150);

context.closePath();

context.stroke();

context.lineWidth=1;

context.font="50px 宋体";

context.fillText("briup",0,220);

context.save();

context.translate(50,50);

context.rotate(90*Math.PI/180);

context.beginPath();

context.lineWidth=10;

context.strokeStyle="red";

context.moveTo(0,0);

context.lineTo(100,0);

context.stroke();

context.closePath();

context.restore();

*/

var g = context.createLinearGradient(0,0,0,200);

g.addColorStop(0,"90BFFF");

g.addColorStop(1,"white");

context.fillStyle = g;

context.fillRect(0,0,1,200);

window.location = c.toDataURL("image/jpeg").replace("image/jpeg","image/octet-stream");

</script>

</body>

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