借助toDataURL实现将HTML5 Canvas的内容保存为图片

百变鹏仔 3个月前 (10-18) #H5教程

文章标签保存为

将HTML5 Canvas的内容保存为图片主要思想是借助Canvas自己的API - toDataURL()来实现，具体实现如下，感兴趣的朋友可以参考下哈，希望对你有所帮助主要思想是借助Canvas自己的API - toDataURL()来实现，整个实现
HTML + JavaScript的代码很简单。

<html> <meta http-equiv="X-UA-Compatible" content="chrome=1"> <head> <script> window.onload = function() { draw(); var saveButton = document.getElementById("saveImageBtn"); bindButtonEvent(saveButton, "click", saveImageInfo); var dlButton = document.getElementById("downloadImageBtn"); bindButtonEvent(dlButton, "click", saveAsLocalImage); }; function draw(){ var canvas = document.getElementById("thecanvas"); var ctx = canvas.getContext("2d"); ctx.fillStyle = "rgba(125, 46, 138, 0.5)"; ctx.fillRect(25,25,100,100); ctx.fillStyle = "rgba( 0, 146, 38, 0.5)"; ctx.fillRect(58, 74, 125, 100); ctx.fillStyle = "rgba( 0, 0, 0, 1)"; // black color ctx.fillText("Gloomyfish - Demo", 50, 50); } function bindButtonEvent(element, type, handler) { if(element.addEventListener) { element.addEventListener(type, handler, false); } else { element.attachEvent(&#39;on&#39;+type, handler); } } function saveImageInfo () { var mycanvas = document.getElementById("thecanvas"); var image = mycanvas.toDataURL("image/png"); var w=window.open(&#39;about:blank&#39;,&#39;image from canvas&#39;); w.document.write("<img src=&#39;"+image+"&#39; alt=&#39;from canvas&#39;/>"); } function saveAsLocalImage () { var myCanvas = document.getElementById("thecanvas"); // here is the most important part because if you dont replace you will get a DOM 18 exception. // var image = myCanvas.toDataURL("image/png").replace("image/png", "image/octet-stream;Content-Disposition: attachment;filename=foobar.png"); var image = myCanvas.toDataURL("image/png").replace("image/png", "image/octet-stream"); window.location.href=image; // it will save locally } </script> </head> <body bgcolor="#E6E6FA"> <p> <canvas width=200 height=200 id="thecanvas"></canvas> <button id="saveImageBtn">Save Image</button> <button id="downloadImageBtn">Download Image</button> </p> </body> </html>

运行效果如下：

文章推荐

借助toDataURL实现将HTML5 Canvas的内容保存为图片

HTML在线编辑器的调用方法和使用方法

AlloyTouch全屏滚动插件 30秒搞定顺滑H5页

HTML5 js实现拖拉上传文件功能

Canvas and Drawables 翻译第一集

Canvas and Drawables 翻译第三集