[featrue]Cross-Origin支持

目前缺乏Cross-Origin设置支持,导致使用canvas进行图片处理无法进行
一段简单的使用canvas将图片转base64代码如下:

cmr = plus.camera.getCamera();  
    return cmr.captureImage(function(pic) {  
      console.log("take photo success:" + pic);  
      return plus.io.resolveLocalFileSystemURL(pic, function(entry) {  
        var canvas, ctx, hideImage;  
        console.log(entry);  
        canvas = document.createElement('canvas');  
        ctx = canvas.getContext("2d");  
        hideImage = new Image();  
        hideImage.src = entry.fullPath;  
        hideImage.crossOrigin = "Anonymous";  
        return hideImage.onload = function() {  
          var imgBase64Str, res;  
          canvas.width = picWidth;  
          canvas.height = picHeight;  
          ctx.drawImage(hideImage, 0, 0);  
          imgBase64Str = canvas.toDataURL("image/" + type);  
          console.log("img type:" + type);  
          console.log("imgBase64Str:" + imgBase64Str);  
          res = imgBase64Str.replace("data:image/" + type + ";base64,", "");  
          console.log("img result:" + res);  
          return console.log({  
            "filePath": pic,  
            "data": res  
          });  
        };  
      }, function(e) {  
        return console.log(e);  
      });  
    }, function(e) {  
      return console.log("take photo fail:" + e.message);  
    });

hideImage.crossOrigin设置过程报错:
Cross-origin image load denied by Cross-Origin Resource Sharing policy.
不进行设置报错:
Uncaught SecurityError: An attempt was made to break through the security policy of the user agent.

这个特性支持的好处是可以去除所有Cross-Origin限制,包括xhr.jar包就可以直接去除了,减少了大量代码出错的可能性及代码维护量