怎么在分享成功的会回调里执行api外的自定义函数？

wx.shareAppMessage({                 title: "",                 path: '/pages/share/share?id=123',                 imageUrl: '',                 success(res){                     console.log("转发成功!!!");                         this.test();                     }                 }, ……

test: function(){        console.log("-----------2222222");    },

要执行这样的效果要怎么做？  现在这样就是就是直接报：this.test is not a function; at api shareAppMessage success callback function……

跪求各位大牛指点一二！！！