vue 3个插槽示例（具名插槽）

　　<div id="app">
        <cpn><span slot="center">replace the middle slot</span></cpn>
        <cpn><span slot="left">replace the left slot</span></cpn>
    </div>
    <template id="cpn">
        <div>
            <slot name="left"><span>left</span></slot>
            <slot name="center"><span>middle</span></slot>
            <slot name="right"><span>right</span></slot>
        </div>
    </template>
    <script src="https://cdn.jsdelivr.net/npm/vue"></script>
    <script>
        const app = new Vue({
            el:'#app',
            data:{
            },
            methods:{
                btnclick(){
                    
                }
            },
            components:{
                cpn:{
                    template:'#cpn'
                }
                
            }
        })
    </script>