var option = {
  api: 'http://h5.2smart.cn/wechat/js/', //授权链接
  debug: false,
  jsApiList: [ ],
  shareData: {
      appmessage: {
          title: "",//好友分享标题
          desc: "",//好友分享描述
          img_url: "",//好友分享图片
          link: "" //好友分享链接
      }, timeline: {
          title: "",//朋友圈分享标题
          img_url: "",//朋友圈分享图片
          link: ""//朋友圈分享链接
      }
  }
};

// var share = new WechatShare('http://h5.2smart.cn',option);
var share = new WechatShare(option);
share.set('appmessage', 'title', "使用 set 函数重新设置标题");
share.set('appmessage', 'link', "http://h5.2smart.cn");
share.update()//更新分享内容