定义一个mixin对象

        const mymixin = {
            data(){
                return {
                    count:2,
                    number:666,
                    childs:12
                }
            },
            created(){
                console.log('mixin created');
            },
            methods:{
                mixinclick(){
                    console.log('mixin click');
                }
            },
        }
        const app = Vue.createApp({
            data(){
                return{
                    count:1
                }
            },
            mixins:[mymixin],
            created(){
                console.log('created');
            },
            template:`
                <div @click="mixinclick">
                    {{count}}
                    {{number}}
                    <child/>
                </div>
            `
        })
        app.component('child',{
            mixins:[mymixin],
            template:`<div>{{childs}}</div>`
        })
        app.mount('#root');

全局mixin

        const app = Vue.createApp({
            data(){
                return{
                    count:1
                }
            },
            //mixins:[mymixin],
            created(){
                console.log('created');
            },
            template:`
                <div @click="mixinclick">
                    {{count}}
                    {{number}}
                    <child/>
                </div>
            `
        })
        app.component('child',{
            //mixins:[mymixin],
            template:`<div>{{childs}}</div>`
        })
        app.mixin({
            data(){
                return {
                    count:2,
                    number:666,
                    childs:12
                }
            },
            created(){
                console.log('mixin created');
            },
            methods:{
                mixinclick(){
                    console.log('mixin click');
                }
            },
        })
        app.mount('#root');

自定义属性

自定义的属性，组件中的优先级高于mixin属性优先级

vue中位定义的属性会保存在 options中，可以通过 this.$options.访问

        const mymixin = {
            data(){
                return {
                    count:2,
                    number:666,
                    childs:12
                }
            },
            created(){
                console.log('mixin created');
            },
            methods:{
                mixinclick(){
                    console.log('mixin click');
                }
            },
        }
        const app = Vue.createApp({
            mixins:[mymixin],
            number:11,
            created(){
                console.log('created');
            },
            template:`
                <div @click="mixinclick">
                    {{count}}
                    <div>{{this.$options.number}}</div>
                    <child/>
                </div>
            `
        })
        app.component('child',{
            mixins:[mymixin],
            template:`<div>{{childs}}</div>`
        })
        app.mount('#root');

更改自定义属性优先级

        app.config.optionMergeStrategies.number = (mixinValue,appValue) =>{
            return mixinValue || appValue;
        }

        const mymixin = {
            number:666,
            data(){
                return {
                    count:2,
                    childs:12
                }
            },
            created(){
                console.log('mixin created');
            },
            methods:{
                mixinclick(){
                    console.log('mixin click');
                }
            },
        }
        const app = Vue.createApp({
            mixins:[mymixin],
            number:1111111111111,
            created(){
                console.log('created');
            },
            template:`
                <div @click="mixinclick">
                    {{count}}
                    <div>{{this.$options.number}}</div>
                    <child/>
                </div>
            `
        })
        app.component('child',{
            mixins:[mymixin],
            template:`<div>{{childs}}</div>`
        })

        app.config.optionMergeStrategies.number = (mixinValue,appValue) =>{
            return mixinValue || appValue;
        }

        app.mount('#root');