将HTML5 Canvas的内容保存为图片借助toDataURL实现
导读：收集整理的这篇文章主要介绍了将HTML5 Canvas的内容保存为图片借助toDataURL实现，觉得挺不错的，现在分享给大家，也给大家做个参考。 主要思想是借助Canvas自己的API - toDataURL( 来实现，整个实现...
收集整理的这篇文章主要介绍了将HTML5 Canvas的内容保存为图片借助toDataURL实现，觉得挺不错的，现在分享给大家，也给大家做个参考。 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。
复制代码代码如下:
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('on'+type, handler);
}
}
function saveImageInfo ()
{
var mycanvas = document.getElementById("thecanvas");
var image = mycanvas.toDataURL("image/png");
var w=window.open('about:blank','image From canvas');
w.document.wrITe("img src='"+image+"' alt='from canvas'/> ");
}
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">
div>
canvas width=200 height=200 id="thecanvas"> /canvas>
button id="saveImageBtn"> Save Image/button>
button id="downloadImageBtn"> Download Image/button>
/div>
/body>
/html>
运行效果如下：
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