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canvas.toDataURL image/png 报错处理方法推荐 _HTML/Xhtml_网页制作

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Release: 2016-05-24 09:05:35
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问题背景:

遇到一个需求,要对播放的视频进行截图,视频使用video标签来播放,然后点击视频播放区域时截取实时的帧图片。

代码很简单如下:

JavaScript Code复制内容到剪贴板
  1. var video = document.getElementById('video');   
  2.   
  3. var canvas = document.getElementById('canvas');   
  4.   
  5. var ctx = canvas.getContext('2d');   
  6.   
  7. var img = document.getElementById('img');   
  8.   
  9. function snapshot() {   
  10.    ctx.drawImage(video,0,0);   
  11.    img.src =  canvas.toDataURL('image/png');   
  12. }   
  13.   
  14. video.addEventListener('click', snapshot, false);   

问题提示:

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

经过查阅和分析,发现这个其实是由于视频文件所在的域和图片和页面所在域不同,出现跨域传输的问题。

解决方案:

将视频文件放到页面所在域下。

原文地址:http://blog.csdn.net/luochao_tj/article/details/44942125

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