cropper.js 跨域问题

    this.$clone = $clone = $('<img>');

    $clone.one('load', $.proxy(function () {
      var naturalWidth = $clone.prop('naturalWidth') || $clone.width(),
          naturalHeight = $clone.prop('naturalHeight') || $clone.height();

      this.image = {
        naturalWidth: naturalWidth,
        naturalHeight: naturalHeight,
        aspectRatio: naturalWidth / naturalHeight,
        rotate: 0
      };

      this.url = url;
      this.ready = true;
      this.build();
    }, this)).one('error', function () {
      $clone.remove();
    }).attr({
//      crossOrigin: crossOrigin, // "crossOrigin" must before "src" (#271)
      src: bustCacheUrl || url
    });

注释掉那行crossOrigin就好了，还不清楚是什么作用