javascriptを使ってWebページをpngファイルに保存したいのですが、以下のサンプルコードに飽きました。しかし、問題は、ダウンロードしているときに拡張子がダウンロードされていることですimage/octet-stream
が、ファイルのダウンロード中に画像をpng形式で保存したいのですが、画像/オクテットストリーム拡張子からpng拡張子に画像をダウンロードするにはどうすればよいですか. コード:
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1">
<title>html2canvas example</title>
<script type="text/javascript" src="js/html2canvas.js"></script>
<script type="text/javascript" src="js/excanvas.js"></script>
<style>
canvas{border:1px solid #222}
</style>
</head>
<body id="target">
<a class="upload" >Upload to Imgur</a>
<a href="#" download="testXXX.jpg" onclick="printImg()" ><img src="images/print-icon.png" alt="Print" width="16" height="16" ></a>
<h2>this is <b>bold</b> <span style="color:red">red</span></h2>
<p> Feedback form with screenshot This script allows you to create feedback forms which include a screenshot,
created on the clients browser, along with the form.
The screenshot is based on the DOM and as such may not be 100% accurate to the real
representation as it does not make an actual screenshot, but builds the screenshot based on the
information available on the page. How does it work? The script is based on the html2canvas library,
which renders the current page as a canvas image, by reading the DOM and the different styles applied
to the elements. This script adds the options for the user to draw elements on top of that image,
such as mark points of interest on the image along with the feedback they send.
It does not require any rendering from the server, as the whole image is created on the clients browser.
No plugins, no flash, no interaction needed from the server, just pure JavaScript! Browser compatibility Firefox 3.5+ Newer versions of Google Chrome, Safari & Opera IE9
</p>
<script type="text/javascript">
function printImg(){
html2canvas( [ document.body ],{
onrendered: function(canvas) {
var img = canvas.toDataURL("image/png").replace("image/png","image/octet-stream;base64");
window.location.href=img;
}
});
}
</script>
</body>
</html>