canvas toDataUrl 跨域问题

时间:2015-10-24 20:05:15   收藏:0   阅读:1206

使用canvas 的 toDataUrl方法会遇到跨域问题

chrome 会报下面的错误:

 Uncaught SecurityError: Failed to execute ‘toDataURL‘ on ‘HTMLCanvasElement‘: Tainted canvases may not be exported.

 

Firefox 会报下面的错误:

SecurityError: The operation is insecure.

 

解决方案分两步:

1、在服务端设置响应头部 

Access-Control-Allow-Origin: *

2、js设置image crossOrigin 为 Anonymous

 

    image.crossOrigin = "Anonymous";
    image.onload = function(){
        context.drawImage(this, 0, 0, 400, 300);
        var base64Url = canvas.toDataURL("image/png");
        console.log(base64Url);
    };
    image.src = imageSrc;

 

原文:http://www.cnblogs.com/rubekid/p/4907347.html

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