[声明式代码](%E7%AC%AC%E5%85%AD%E7%AB%A0%E7%A4%BA%E4%BE%8B%E5%BA%94%E7%94%A8/%E5%A3%B0%E6%98%8E%E5%BC%8F%E4%BB%A3%E7%A0%81.md) [实例项目:获取图片](%E7%AC%AC%E5%85%AD%E7%AB%A0%E7%A4%BA%E4%BE%8B%E5%BA%94%E7%94%A8/%E5%AE%9E%E4%BE%8B.md)