code: function renameStyle(content) {
      var styleShaeReg = /<(path|rect|circle|polygon|line|polyline|g|ellipse).+>/gi;
      var styleReg = /fill=\"|stroke="/gi;
      content = content.replace(styleShaeReg, function (shape) {
          return shape.replace(styleReg, function (styleName) {
              return '_' + styleName;
          });
      });
      return content;
  }
docs: rename fill and stroke. (It can restroe in vue-svgicon)