只有最后一个组件才能获得详细信息

Question

我正在使用加密货币的应用程序,所以现在我有2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/coins'上我得到这些数据:

{"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);
}

})

在网址'api/coin/{name}'我得到这些数据:

{"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"}}

但截至目前,只有最后一个组件填写了详细信息(name,price_usd,price_eur等),而不是前3个组件.

这是加载页面的视频:https://gfycat.com/gifs/detail/BreakableSlimHammerkop - 你可以看到它应该通过它应该传递给前三个组件的所有硬币.我究竟做错了什么？

Answer 1

问题是因为self您在getStats()和getCoin()方法中声明的变量绑定到window对象,并且没有适当地确定每个方法的范围.一个简单的解决方法是用每个self = this;语句替换var self = this;.

让我解释.

当你声明一个新的变量不使用var,let或const关键字,变量被添加到全球范围内的对象,在这种情况下是window对象.您可以在https://toddmotto.com/everything-you-wanted-to-know-about-javascript-scope/找到有关此JavaScript行为的更多信息,或查看MDN上的var docs(https://developer.mozilla. org/zh-CN/docs/Web/JavaScript/Reference/Statements/var)