只有最后一个组件才能得到详细信息。

Question

我正在开发一个使用加密货币的应用程序，所以现在我有两个组件: MyCoins：

Vue.component('mycoins',{
data() {
    return {
        coins: [],
    }
},
template: `
    <ul class="coins">
        <coin v-for="(coin, key) in coins" :coin="coin.coin_name" :key="coin.coin_name"></coin>
    </ul>
`,
methods: {
    getStats() {
        self = this;
        axios.get('api/user/coins').then(function (response) {
            console.log(response.data.coins);
            self.coins = response.data.coins;
          })
          .catch(function (error) {
            console.log(error);
          });
    }
},
mounted() {
    this.getStats();
}

})

在url‘api/user/铜币’上，我得到以下数据：

{"coins":
[{"id":1,"coin_name":"ethereum","user_id":1,"buy_price_usd":"341.44000","buy_price_btc":"0.14400","created_at":"2017-09-25 20:40:20","updated_at":"2017-09-25 20:40:20"},
    {"id":2,"coin_name":"bitcoin","user_id":1,"buy_price_usd":"12.00000","buy_price_btc":"14.00000","created_at":"2017-09-25 21:29:18","updated_at":"2017-09-25 21:29:18"},
    {"id":3,"coin_name":"ethereum-classic","user_id":1,"buy_price_usd":"33.45000","buy_price_btc":"3.00000","created_at":"2017-09-25 21:49:50","updated_at":"2017-09-25 21:49:50"},{"id":4,"coin_name":"lisk","user_id":1,"buy_price_usd":"23.33000","buy_price_btc":"0.50000","created_at":"2017-09-25 21:51:26","updated_at":"2017-09-25 21:51:26"}]}

然后我有了这个组件:硬币：

Vue.component('coin',{
data() {
    return {
        thisCoin: this.coin,
        coinData: {
            name: "",
            slug: "",
            image: "https://files.coinmarketcap.com/static/img/coins/32x32/.png",
            symbol: "",
            price_eur: "",
            price_usd: "",
        }
    }
},
props: ['coin'],
template: `
    <li class="coin">
        <div class="row">
            <div class="col col-lg-2 branding">
                <img :src="this.coinData.image">
                <small>{{this.coinData.name}}</small>
            </div>
            <div class="col col-lg-8 holdings">
                <p>11.34 <span>{{this.coinData.symbol}}</span></p>
                <p>$ {{this.coinData.price_usd * 3}}</p>
            </div>
            <div class="col col-lg-2 price">
                <p>{{this.coinData.price_usd}}</p>
            </div>
            <div class="edit col-lg-2">
                <ul>
                    <li>
                        <p>Edit</p>
                    </li>
                    <li>
                        <p>Delete</p>
                    </li>
                </ul>
            </div>
        </div>
    </li>
`,
methods: {
    getCoin: function(name) {
        self = this;
        axios.get('api/coin/' + name).then(function (response) {
            console.log(response);
            self.coinData.name = response.data.coin.name;
            self.coinData.price_usd = response.data.coin.price_usd;
            self.coinData.price_eur = response.data.coin.pride_eur;
          })
          .catch(function (error) {
            console.log(error);
          });
    }
},
mounted() {
    this.getCoin(this.coin);
}

})

在url‘api/铜币/{name}’上，我得到以下数据：

{"coin":{"slug":"lisk","name":"Lisk","symbol":"LSK","rank":14,"price_usd":"6.15510","price_btc":"0.00156","24h_volume_usd":null,"market_cap_usd":"99999.99999","available_supply":"99999.99999","total_supply":"99999.99999","percent_change_1h":"0.10000","percent_change_24h":"6.78000","percent_change_7d":"-5.64000","last_updated":1506385152,"price_eur":"5.19166","24h_volume_eur":null,"market_cap_eur":"99999.99999","created_at":"2017-09-25 00:06:27","updated_at":"2017-09-26 00:23:02"}}

但到目前为止，只有最后一个组件得到了填充的详细信息(名称、price_usd、price_eur等)，而不是前三个组件。

这是加载页面的视频：https://gfycat.com/gifs/detail/BreakableSlimHammerkop --你可以看到它通过所有应该传递给前三个组件的硬币。我做错了什么？

Answer 1

问题在于，您在getStats()和getCoin()方法中声明的getCoin()变量绑定到window对象，并且没有对每个方法进行适当的限定范围。一个简单的解决方法是将每个self = this;语句替换为var self = this;。

让我解释一下。

当您在不使用var、let或const关键字的情况下声明一个新变量时，变量将被添加到全局作用域对象中，在本例中，该对象就是window对象。您可以在这里找到更多关于JavaScript行为的信息，https://toddmotto.com/everything-you-wanted-to-know-about-javascript-scope/或查看MDN (https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/var)上的var docs。

Answer 2

您不应该直接重新分配数据值，因为Vue无法检测属性添加和重发视图。您应该通过Vue.set或this.$set这样做：

self.$set(self.coinData, 'name', response.data.coin.name)
...