avascript 导出div为图片PNG，div转svg,svg转canvas
<!DOCTYPE html>
<html><body>
<h2>Input Div:</h2>
<div id="div">
<p>Just have a <span style=color:white; text-shadow:0 0 2px blue;>TRY</span></p><p><b>By Dion</b></p>
</div>
<h2>Output Image:</h2>
<script>
//1.将div转成svg
var divContent = document.getElementById("div").innerHTML;
var data = "data:image/svg+xml," +
"<svg xmlns=http://www.w3.org/2000/svg width=200 height=200>" +
"<foreignObject width=100% height=100%>" +
"<div xmlns=http://www.w3.org/1999/xhtml style=font-size:16px;font-family:Helvetica>" +
divContent +
"</div>" +
"</foreignObject>" +
"</svg>";
var img = new Image();
img.src = data;
document.getElementsByTagName(body)[0].appendChild(img);
//2.svg转成canvas
var canvas = document.createElement(canvas); //准备空画布
canvas.width = img.width;
canvas.height = img.height;
var context = canvas.getContext(2d); //取得画布的2d绘图上下文
context.drawImage(img, 0, 0);
//var a = document.createElement(a);
//a.href = canvas.toDataURL(image/png); //将画布内的信息导出为png图片数据
//a.download = "MapByMathArtSys"; //设定下载名称
//a.click(); //点击触发下载
//3. 图片导出为 png 格式
var type = png;
var imgData = canvas.toDataURL(type);
/**
* 获取mimeType
* @param {String} type the old mime-type
* @return the new mime-type
*/
var _fixType = function (type) {
type = type.toLowerCase().replace(/jpg/i, jpeg);
var r = type.match(/png|jpeg|bmp|gif/)[0];
return image/ + r;
};
// 加工image data，替换mime type
imgData = imgData.replace(_fixType(type), image/octet-stream);
/**
* 在本地进行文件保存
* @param {String} data 要保存到本地的图片数据
* @param {String} filename 文件名
*/
var saveFile = function (data, filename) {
var save_link = document.createElementNS(http://www.w3.org/1999/xhtml, a);
save_link.href = data;
save_link.download = filename;
var event = document.createEvent(MouseEvents);
event.initMouseEvent(click, true, false, window, 0, 0, 0, 0, 0, false, false, false, false, 0, null);
save_link.dispatchEvent(event);
};
// 下载后的图片名
var filename = baidufe_ + (new Date()).getTime() + . + type;
// download
saveFile(imgData, filename);
</script>
</body></html>
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