vue keep-alive 生命周期

Z时代
2024-01-10
分类：综合

vue

父组件

<!--  -->
<template>
    <div class="">
        <keep-alive>
            <testa v-if="test"></testa>
            <testb v-else></testb>
        </keep-alive>
        <button @click="change">test change</button>
    </div>
</template>
<script>
import testa from "./testA";
import testb from "./testB";
export default {
    components: { testa,testb, },
    data() {
        return {
            test:true
        };
    },
    computed: {},
    watch: {
        name: {
            handler(val, oldVal) {
                /* ... */
            },
            deep: true,
            immediate: true
        }
    },
    methods: {
        change(){
            this.test = !this.test;
        }
    }
};
</script>

组件A：

<!--  -->
<template>
    <div class="">
        about-componnet
    </div>
</template>
<script>
export default {
    components: {},
    data() {
        return {};
    },
    computed: {},
    watch: {
        name: {
            handler(val, oldVal) {
                /* ... */
            },
            deep: true,
            immediate: true
        }
    },
    methods: {},
    beforeCreate() {
        console.log("A--beforeCreate");
    },
    created() {
        console.log("A--created");
    },
    beforeMount() {
        console.log("A--beforeMount");
    },
    mounted() {
        console.log("A--mounted");
    },
    beforeDestroy() {
        console.log("A--beforeDestroy");
    },
    activated() {
        console.log("A--activated");
    },
    deactivated() {
        console.log("A--deactivated");
    }
};
</script>

组件B：

<!--  -->
<template>
    <div class="">
        about-componnet
    </div>
</template>
<script>
export default {
    components: {},
    data() {
        return {};
    },
    computed: {},
    watch: {
        name: {
            handler(val, oldVal) {
                /* ... */
            },
            deep: true,
            immediate: true
        }
    },
    methods: {},
    beforeCreate() {
        console.log("B--beforeCreate");
    },
    created() {
        console.log("B--created");
    },
    beforeMount() {
        console.log("B--beforeMount");
    },
    mounted() {
        console.log("B--mounted");
    },
    beforeDestroy() {
        console.log("B--beforeDestroy");
    },
    activated() {
        console.log("B--activated");
    },
    deactivated() {
        console.log("B--deactivated");
    }
};
</script>

切换组件A和组件B，控制台打印：

// A组件首次激活 A--beforeCreate A--created A--beforeMount A--mounted A--activated // B组件首次激活，A组件失活 B--beforeCreate B--created B--beforeMount A--deactivated B--mounted B--activated // B组件失活，A组件激活 B--deactivated A--activated // A组件失活，B组件激活 A--deactivated B--activated

结论：