code: function genComponentContextCode(component, componentIdInContext) {
      var code = ['var componentCtx = {'];
  
      // proto
      code.push('proto: ' + componentIdInContext + 'Proto,');
  
      // sourceSlots
      code.push('sourceSlots: sourceSlots,');
  
      // data
      var defaultData = component.data.get();
      code.push('data: data || ' + stringifier.any(defaultData) + ',');
  
      // parentCtx
      code.push('owner: parentCtx,');
  
      // slotRenderers
      code.push('slotRenderers: {}');
  
      code.push('};');
  
      return code.join('\n');
  }
docs: 生成组件 renderer 时 ctx 对象构建的代码
  
  @inner
  @param {Object} component 组件实例
  @return {string}