Code example analysis of key keep-alive in Vue-JS Tutorial-php.cn

Code example analysis of key keep-alive in Vue

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Release： 2018-09-18 14:38:45

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keep-alive key

<!DOCTYPE html>
<html>
<head>
    <title></title>
    <script type="text/javascript" src="./vue.js"></script>
</head>
<body>
    <p id="app">
        <keep-alive>
            <child-component key="1" v-if="seen" name="1"></child-component>
            <child-component key="2" v-if="!seen" name="2"></child-component>
        </keep-alive>
        <button @click="toggle">toggle</button>
    </p>
    <script type="text/javascript">
        Vue.component('child-component', {
            template: `<input type="text" placeholder="enter">`,
            data() {
                return {}
            },
            props: ["name"],
            mounted() {
                console.log(`${this.name} mounted`)
            }
        })
        const vm = new Vue({
            el: "#app",
            data: {
                seen: true
            },
            methods: {
                toggle() {
                    this.seen = !this.seen;
                }
            }
        })
    </script>
</body>
</html>

Copy after login

Key is the identification element that will no longer be reused. Note that key is a reserved attribute in Vue and cannot be passed to sub-components as props, otherwise it will be in the control I saw Vue's error

but the keep-alive flag does not create component instances repeatedly, that is, it will only trigger the created mounted event once.

You can use both The reuse of components is managed more carefully

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