<script lang="ts" setup> import { defineProps } from 'vue' interface TableData { // 定义表格数据的类型 } const props = defineProps({ tableData: { type: Array as () => TableData[], default: () => [] } }) </script>中为什么props没有读取值
时间: 2024-02-16 18:03:01 浏览: 169
在使用 `<script lang="ts" setup>` 时,组件的 props 是通过 `defineProps` 函数来定义的,并且 props 的值是通过解构赋值的方式来获取的,而非通过 `this` 来获取。因此,如果你想要读取 `props.tableData` 的值,应该使用以下方式:
```typescript
<script lang="ts" setup>
import { defineProps } from 'vue'
interface TableData {
// 定义表格数据的类型
}
const props = defineProps({
tableData: {
type: Array as () => TableData[],
default: () => []
}
})
console.log(props.tableData) // 在控制台输出 props.tableData
</script>
```
在上述代码中,我们使用 `console.log` 来输出 `props.tableData` 的值,以方便在开发过程中调试代码。你可以根据实际需求来使用 `props.tableData` 的值来渲染组件。
相关问题
如果我将propertyData 传得给子组件的表单 改如何赋值 <div class="body"> <el-table :data="tableData" style="width: 100%"> <el-table-column :prop="tableData" label="highlight" style="width: 50%" /> <el-table-column prop="date" label="时间" style="width: 50%" /> </el-table> </div> </popover> </template> <script lang="ts"> import popover from "@/components/Popover/index.vue"; import { computed, defineComponent, ref } from "vue"; export default defineComponent({ name: "LayerManager", components: { popover, }, emits: ["hide"], props: { visible: { type: Boolean, default: true, }, tableData: { type: Array, default: [] as any, }, },
在 Vue 组件中,如果要将 `propertyData` 的值传递给子组件的表单,你可以通过 `props` 将其传递给子组件,并在子组件中使用该值来进行赋值。
首先,在父组件中,将 `propertyData` 作为 `tableData` 的值传递给子组件:
```html
<template>
<div>
<popover :tableData="propertyData"></popover>
</div>
</template>
<script lang="ts">
import popover from "@/components/Popover/index.vue";
import { defineComponent, ref } from "vue";
export default defineComponent({
name: "LayerManager",
components: {
popover,
},
setup() {
const propertyData = ref([]); // propertyData 的定义和赋值逻辑
// 其他代码...
return {
propertyData,
};
},
});
</script>
```
然后,在子组件中的模板中,使用 `tableData` 接收父组件传递的 `propertyData` 值,并将其赋给相应的表单:
```html
<template>
<div class="body">
<el-table :data="tableData" style="width: 100%">
<el-table-column prop="highlight" label="highlight" style="width: 50%" />
<el-table-column prop="date" label="时间" style="width: 50%" />
</el-table>
</div>
</template>
<script lang="ts">
import { defineComponent } from "vue";
export default defineComponent({
name: "Popover",
props: {
tableData: {
type: Array,
default: [] as any,
},
},
});
</script>
```
这样,`propertyData` 的值将会传递给子组件的 `tableData` 属性,并在子组件中使用该值进行表单的赋值。请根据实际情况调整代码和逻辑。
优化这段代码<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta http-equiv="X-UA-Compatible" content="IE=edge"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <title>图书购物车</title> <style> </style> <script src="js/vue.js"></script> </head> <body> <div id="demo"> <table border="1"> <tr> <td></td> <td>书籍名称</td> <td>出版日期</td> <td>价格</td> <td>购买数量</td> <td>操作</td> </tr> <tr> <td></td> <td>{{books1.name}}</td> <td>{{books1.date}}</td> <td>¥{{books1.price}}</td> <td><button @click="down(books1)">-</button>{{books4.count}}<button @click="up(books1)">+</button></td> <td><button @click="del">移除</button></td> </tr> <tr> <td></td> <td>{{books2.name}}</td> <td>{{books2.date}}</td> <td>¥{{books2.price}}</td> <td> <button @click="down(books2)">-</button>{{books4.count}}<button @click="up(books2)">+</button> </td> <td><button @click="del">移除</button></td> </tr> <tr> <td></td> <td>{{books3.name}}</td> <td>{{books3.date}}</td> <td>¥{{books3.price}}</td> <td> <button @click="down(books3)">-</button>{{books4.count}}<button @click="up(books3)">+</button> </td> <td><button @click="del">移除</button></td> </tr> <tr> <td></td> <td>{{books4.name}}</td> <td>{{books4.date}}</td> <td>¥{{books4.price}}</td> <td> <button @click="down(books4)">-</button>{{books4.count}}<button @click="up(books4)">+</button> </td> <td><button @click="del">移除</button></td> </tr> </table> <div>总价: ¥{{sum}}</div> </div> <!-- js部分 --> <script> const vm = new Vue({ el: "#demo", data: { books1: { name: '《算法导论》', date: '2006-9', price: 85.00, count: 1 }, books2: { name: '《UNIX编程艺术》', date: '2006-2', price: 59.00, count: 1 }, books3: { name: '《编程珠玑》', date: '2008-10', price: 39.00, count: 1 }, books4: { name: '《代码大全》', date: '2006-3', price: 128.00, count: 1 } }, computed: { sum () { return this.books1.price * this.books1.count + this.books2.price * this.books2.count + this.books3.price * this.books3.count + this.books4.price * this.books4.count } }, methods: { down (books1) { this.books1.count = books1.count - 1; } } }) </script> </body> </html>
优化建议:
1. 使用数组来存储书籍信息,可以避免重复的代码和变量
2. 使用计算属性来计算总价,避免重复计算
3. 将操作封装成方法,并使用可复用的组件来渲染每一行
优化后的代码如下:
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>图书购物车</title>
<style>
</style>
<script src="js/vue.js"></script>
</head>
<body>
<div id="demo">
<table border="1">
<tr>
<td></td>
<<td>书籍名称</td>
<td>出版日期</td>
<td>价格</td>
<td>购买数量</td>
<td>操作</td>
</tr>
<book-row v-for="(book, index) in books"
:book="book"
:index="index"
:key="index"
@change-count="changeCount"
@remove-book="removeBook" />
</table>
<div>总价: ¥{{totalPrice}}</div>
</div>
<!-- js部分 -->
<script>
Vue.component('book-row', {
props: ['book', 'index'],
methods: {
down() {
if (this.book.count > 1) {
this.book.count--;
this.$emit('change-count');
}
},
up() {
this.book.count++;
this.$emit('change-count');
},
remove() {
this.$emit('remove-book', this.index);
}
},
template: `
<tr>
<td></td>
<td>{{book.name}}</td>
<td>{{book.date}}</td>
<td>¥{{book.price}}</td>
<td>
<button @click="down">-</button>
{{book.count}}
<button @click="up">+</button>
</td>
<td>
<button @click="remove">移除</button>
</td>
</tr>
`
});
const vm = new Vue({
el: "#demo",
data() {
return {
books: [
{ name: '书籍1', date: '2022-01-01', price: 30, count: 1 },
{ name: '书籍2', date: '2022-01-01', price: 40, count: 1 },
{ name: '书籍3', date: '2022-01-01', price: 50, count: 1 },
{ name: '书籍4', date: '2022-01-01', price: 60, count: 1 }
]
};
},
methods: {
changeCount() {
// 重新计算总价
},
removeBook(index) {
this.books.splice(index, 1);
// 重新计算总价
},
},
computed: {
totalPrice() {
return this.books.reduce((acc, cur) => acc + cur.price * cur.count, 0);
}
}
});
</script>
</body>
</html>
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