code: function (ComponentClass) {
              var renderer = ComponentClass.__ssrRenderer;
  
              if (!renderer) {
                  var code = compileJSSource(ComponentClass);
                  renderer = (new Function('return ' + code))();
                  ComponentClass.__ssrRenderer = renderer;
              }
  
              return renderer;
          }
docs: #[begin] ssr 
  将组件类编译成 renderer 方法
  
  @param {Function} ComponentClass 组件类
  @return {function(Object):string}