cropper头像裁剪（PC端）
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main.js第148行
case 'getCroppedCanvas':
if (result) {
var imgBase=result.toDataURL('image/jpeg');//这行出现问题，浏览器提示如下[1]
var data={imgBase:imgBase};
$.post('../upload.php',data,function(ret){
if(ret=='true'){
alert('上传成功');
}else{
alert('上传失败');
}
},'text');
}
[1]:
Uncaught DOMException: Failed to execute 'toDataURL' on 'HTMLCanvasElement': Tainted canvases may not be exported.
at HTMLButtonElement. (file:///C:/inetpub/wwwroot/%E5%9B%BE%E7%89%87%E8%A3%81%E5%89%AA/js/main.js:151:32)
at HTMLDivElement.dispatch (file:///C:/inetpub/wwwroot/%E5%9B%BE%E7%89%87%E8%A3%81%E5%89%AA/js/jquery.min.js:3:28337)
at HTMLDivElement.v.handle (file:///C:/inetpub/wwwroot/%E5%9B%BE%E7%89%87%E8%A3%81%E5%89%AA/js/jquery.min.js:3:25042)
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