[英]Canvas - Cannot create image url
我用两个图像设置了一个小提琴。 我不明白为什么图片A)不适合,对我来说,来源看起来与图片B)的来源相似。
的HTML
A)<img src="http://img.ui-portal.de/uim/Coop/monster-beratung_140x115.jpg" />
B)<img src="http://i0.gmx.net/images/258/18821258,pd=2,h=250,mxh=600,mxw=800,w=480.jpg" />
<h4> Display images above with dataURL as source: </h4>
<div id="converted" ></div>
JS
//create canvas-image from A)
var imgA = new Image();
imgA.crossOrigin = "anonymous";
imgA.src = "http://img.ui-portal.de/uim/Coop/monster-beratung_140x115.jpg";
imgA.onload = function(){
var canvasA = document.createElement('canvas');
canvasA.width = imgA.width;
canvasA.height = imgA.height;
var ctxA = canvasA.getContext('2d');
ctxA.drawImage(imgA, 0, 0);
var imgURl = canvasA.toDataURL();
console.log("die url: "+ imgURl)
$("#converted").append("<img src="+imgURl +" />");
}
//create canvas-image from B)
var imgB = new Image();
imgB.crossOrigin = "anonymous";
imgB.src = "http://i0.gmx.net/images/258/18821258,pd=2,h=250,mxh=600,mxw=800,w=480.jpg";
imgB.onload = function(){
var canvasB = document.createElement('canvas');
canvasB.width = imgB.width;
canvasB.height = imgB.height;
var ctxB = canvasB.getContext('2d');
ctxB.drawImage(imgB, 0, 0);
var imgURl = canvasB.toDataURL();
console.log("die url: "+ imgURl)
$("#converted").append("<img src="+imgURl +" />");
}
第一张图片受所有者保护。
查看调试器消息
Image from origin 'http://img.ui-portal.de' has been blocked from loading by Cross-Origin
Resource Sharing policy: No 'Access-Control-Allow-Origin' header is present on the
requested resource. Origin 'http://fiddle.jshell.net' is therefore not allowed access.
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