docs: function processRelativePath(cssPath, importCssPath, importCssText) {
          cssPath = cssPath.split('\\');
          importCssPath = importCssPath.split('/');
          var isSibling = importCssPath.length == 1;
          return importCssText.replace(reg, function(css, before, imgPath, after) {
              if (/^http\S/.test(imgPath) || /^\/\S/.test(imgPath) || isSibling) { //绝对路径or同级跳过
                  return css;
              }
              imgPath = imgPath.split('/');
              imgPath = getRelativePath(cssPath, importCssPath, imgPath);
              return before + imgPath + after;
          });
      }