https://www.weixinsxy.com/jssdk/

previewImage 示例中的图片地址已失效：

document.querySelector('#previewImage').onclick = function() {
     wx.previewImage({
          current: 'http://img5.douban.com/view/photo/photo/public/p1353993776.jpg',
          urls: [
              'http://img3.douban.com/view/photo/photo/public/p2152117150.jpg',
              'http://img5.douban.com/view/photo/photo/public/p1353993776.jpg',
              'http://img3.douban.com/view/photo/photo/public/p2152134700.jpg'
          ]
      });
};