axios.get('https://www.apiopen.top/satinCommentApi?id=27610708', {
params: {
}
}).then(function(data) {
Vue.set(app, 'messages', data.data.data.normal.list)
}).catch(function (error) {
console.log(error);
});

或者用 箭头函数

axios.get('https://www.apiopen.top/satinCommentApi?id=27610708', {
params: {
page: this.page
}
}).then((data) => {
this.messages = data.data.data.normal.list;
}).catch(function (error) {
console.log(error);
});