Vue.JS：页面加载后如何调用函数？

Question

新手上路，请多包涵

我有下一个 Vue 组件。 Login 作为调用登录函数。 checkAuth 正在调用检查页面刷新之间的授权状态。

但是我如何在不按下按钮的情况下调用 checkAuth 呢？

 var GuestMenu = Vue.extend({
    props: ['username', 'password'],
    template: `
        <div id="auth">
            <form class="form-inline pull-right">
                <div class="form-group">
                    <label class="sr-only" for="UserName">User name</label>
                  <input type="username" v-model="username" class="form-control" id="UserName" placeholder="username">
                </div>
                <div class="form-group">
                  <label class="sr-only" for="Password">Password</label>
                  <input type="password" v-model="password" class="form-control" id="Password" placeholder="Password">
                </div>
              <button type="submit" class="btn btn-default" v-on:click.prevent="sendLoginInfo()">LOGIN</button>
              <button type="submit" class="btn btn-default" v-on:click.prevent="checkAuth()">CheckAuth</button>
            </form>
        </div>`,

    methods: {
        //hash key-value
        sendLoginInfo: sendLoginInfo, // key (anyname) | value -> calling function name (from separate file)

        //calling without brackets because we do need return from function, we need just function
        checkAuth: checkAuth // restore authorization after refresh page if user already have session!
    }
});

我试图从 App 调用它：

 App = new Vue({ // App -- is need for overwrite global var. Global var need declarated abobe all function, because some it's function is calling from outside
        el: '#app',
        data: {
            topMenuView: "guestmenu",
            contentView: "guestcontent",
            username: "",
            password: "",

        },
        ready: function() {
            checkAuth(); // Here

        }
    }
)

但它看起来像是在没有加载所有组件时调用，

 function checkAuth() {
    // we should NOT send any data like: loginData because after refreshing page
    // all filds are empty and we need to ask server if he have authorize session

    console.log("Checking if user already have active session");

    this.$http.post('http://127.0.0.1:8080/checkAuthorization').then(function(response) {
            console.log("server response: ", response.data)
        }
    }
    // ...
}

在这里我收到错误：

authorization.js:69 Uncaught TypeError: Cannot read property 'post' of undefined

我试着做：

 {
// ...
    methods: { //hash key-value
      sendLoginInfo : sendLoginInfo, // key (anyname) | value -> calling function name (from separate file)
      //calling without brackets because we do need return from function, we need just function

    },
    ready()
    {
      checkAuth()
    }
// ...
}

但又出现错误： Uncaught TypeError: Cannot read property 'post' of undefined

我做错了什么？