动态的控制表格列的展示，

• 可以勾选和取消某一列的显示
• 本地存储上一次的配置
• 表格内容支持通过slot自定义内容
  

例子1

<script setup>
import { reactive, ref, watch } from "vue";
import one from "./components/one.vue";
import One from "./components/one.vue";
const tableData = [{id: 1,age: "2016-05-03",name: "Tom",address: "No. 189, Grove St, Los Angeles",},{id: 2,age: "2016-05-02",name: "Tom",address: "No. 189, Grove St, Los Angeles",},{id: 3,age: "2016-05-04",name: "Tom",address: "No. 189, Grove St, Los Angeles",},{id: 4,age: "2016-05-01",name: "Tom",address: "No. 189, Grove St, Los Angeles",},
];const config = {name: {label: "name",prop: "name",canHidde: false,},age: {label: "age",prop: "age",canHidde: false,},address: {label: "address",prop: "address",canHidde: false,redner: One,},id: {label: "id",prop: "id",canHidde: true,},
};let state = reactive({});
if (localStorage.getItem("state")) {//JDON.parse()解析时可能会出现解析错误的情况，要使用try catch包裹try {// reactive不能直接复制整个对个，可以重新复制reactivestate = reactive(JSON.parse(localStorage.getItem("state")));} catch (e) {console.log(e);}
} else {Object.keys(config).forEach((key) => {state[key] = true;});
}
const setState = (state) => {localStorage.setItem("state", JSON.stringify(state));
};watch(state, (val) => {setState(val);
});
</script><template><div><div v-for="item in Object.keys(state)"><div><span>{{ config[item].label }}</span><el-checkboxv-model="state[item]":disabled="config[item].canHidde"></el-checkbox></div></div><el-table :data="tableData" style="width: 100%"><template v-for="item in Object.keys(state)" :key="item"><!---v-bind可以快速绑定多个变量--><el-table-column v-bind="config[item]" v-if="state[item]"><template #header><div><span>{{ config[item].label }}</span><el-checkboxv-model="state[item]":disabled="config[item].canHidde"></el-checkbox></div></template><template v-if="config[item].redner" #default="scoped"><component :is="config[item]?.redner" :scoped="scoped"></component></template></el-table-column></template></el-table></div>
</template><style scoped></style>

例子2 ，插槽使用 h函数渲染

• 模板中的插值语法 {{ }} 的作用是：把表达式的值转换成字符串，插入到 HTML 中。

• h() 返回一个 VNode 对象， 让 Vue 把一个 VNode 对象 转成字符串。Vue 内部会尝试 JSON.stringify(vnode)，但 VNode 对象中包含循环引用（如 vnode.component.vnode 指回自己），所以就会报错:
  

• <component :is="..."> 不仅可以切换组件，还可以直接渲染 VNode

<script setup>
import { reactive, ref, watch, h } from "vue";
const config = {name: {label: "name",prop: "name",canHidde: false,},age: {label: "age",prop: "age",canHidde: false,},address: {label: "address",prop: "address",canHidde: false,render: (scoped) => {return h("div",{style: {color: "red",},},scoped.row.address);},},id: {label: "id",prop: "id",canHidde: true,},
};
</script><template><div><el-table :data="tableData" style="width: 100%"><template v-for="item in Object.keys(state)" :key="item"><el-table-column v-bind="config[item]" v-if="state[item]"><template #header><div><span>{{ config[item].label }}</span><el-checkboxv-model="state[item]":disabled="config[item].canHidde"></el-checkbox></div></template><template v-if="config[item].render" #default="scoped"><!--{{config[item].render(scoped)}}直接这样使用会报错-->    <component :is="config[item].render(scoped)" /></template></el-table-column></template></el-table></div>
</template>