switch (val) { case '1': this.morse = true this.crcuit = true break case '2': this.morse = true this.crcuit = true this.highest = true break case '3': this.highest = true this.necessary = true break case '4': this.peak = true this.morse = true break case
时间: 2024-03-17 18:40:07 浏览: 23
缺少switch语句的结尾大括号。应该在代码最后加上一个大括号" } "来结束switch语句。同时,每一个case语句应该以冒号":"结尾。修改后的代码如下:
```
switch (val) {
case '1':
this.morse = true;
this.crcuit = true;
break;
case '2':
this.morse = true;
this.crcuit = true;
this.highest = true;
break;
case '3':
this.highest = true;
this.necessary = true;
break;
case '4':
this.peak = true;
this.morse = true;
break;
}
```
相关问题
class TreeNode: def init(self, val): self.val = val self.left = None self.right = None class BinaryTree: def init(self): self.root = None def insert(self, val): new_node = TreeNode(val) if self.root is None: self.root = new_node else: current = self.root while True: if val < current.val: if current.left is None: current.left = new_node break else: current = current.left else: if current.right is None: current.right = new_node break else: current = current.right def preorder_traversal(self, node): if node is not None: print(node.val, end=' ') self.preorder_traversal(node.left) self.preorder_traversal(node.right) def inorder_traversal(self, node): if node is not None: self.inorder_traversal(node.left) print(node.val, end=' ') self.inorder_traversal(node.right) def postorder_traversal(self, node): if node is not None: self.postorder_traversal(node.left) self.postorder_traversal(node.right) print(node.val, end=' ')如何实现
你给出的这段代码实现了二叉树的构建和三种遍历方式,其中 `BinaryTree` 类用于构建二叉树,包含了 `insert` 方法来插入新结点,而 `preorder_traversal`、`inorder_traversal` 和 `postorder_traversal` 方法用于实现前序、中序和后序遍历。
如果你想要用这个类来构建二叉树并遍历它,可以按照以下步骤:
1. 创建一个 `BinaryTree` 对象。
2. 用 `insert` 方法插入一些结点,以构建二叉树。
3. 调用 `preorder_traversal`、`inorder_traversal` 或 `postorder_traversal` 方法,传入树的根结点作为参数,即可实现对应的遍历方式。
下面是一个例子:
```python
# 创建一个二叉树,并插入一些结点
tree = BinaryTree()
tree.insert(5)
tree.insert(3)
tree.insert(7)
tree.insert(1)
tree.insert(4)
tree.insert(6)
tree.insert(8)
# 前序遍历二叉树
print("前序遍历:", end="")
tree.preorder_traversal(tree.root)
# 中序遍历二叉树
print("\n中序遍历:", end="")
tree.inorder_traversal(tree.root)
# 后序遍历二叉树
print("\n后序遍历:", end="")
tree.postorder_traversal(tree.root)
```
输出结果为:
```
前序遍历:5 3 1 4 7 6 8
中序遍历:1 3 4 5 6 7 8
后序遍历:1 4 3 6 8 7 5
```
注意,这里的 `BinaryTree` 类并没有实现删除结点的功能,如果需要删除结点,需要进一步完善类中的方法。
methods: { // 按钮点击事件 显示新增编辑弹窗组件 show() { this.addOrUpdateVisible = true; }, showAddOrUpdate(data) { if (data === "false") { this.addOrUpdateVisible = false; } else { this.addOrUpdateVisible = true; } }, // 确认删除 handleConfirm() { var params = this.id deleteCategory(params).then((res) => { if (res.data.state === '200') { this.$router.push({ path: "/" }); } }) }, // 接收路由跳转传来的id getId() { this.id = this.$route.query.id }, // 获取新的页数 getNewPage(val) { this.currentPage = val }, // 分页获取帖子 getArticleByPage() { var params = { currentPage: this.currentPage, pageSize: this.pagesize, categoryId: this.$route.query.id, source: this.source, parameter: this.parameter } getArticlePage(params).then((res) => { }) }, //路由跳转到帖子详情界面 Articli_detail(item) { this.$router.push({ path: "/articledetail", query: { id: item.id } }) }, // 置顶帖子 handleTop(item) { var params = { articleId: item.id, categoryId: this.$route.query.id, top: true } topArticle(params).then((res) => { }) }, }, watch: { currentPage() { this.getArticleByPage() } }, beforeCreated() { this.getNewPage() }, created() { this.getId() this.getArticleByPage() }, };请将代码用async和await改写
你可以使用async和await来改写这段代码。下面是改写后的代码:
```javascript
methods: {
show() {
this.addOrUpdateVisible = true;
},
showAddOrUpdate(data) {
if (data === "false") {
this.addOrUpdateVisible = false;
} else {
this.addOrUpdateVisible = true;
}
},
async handleConfirm() {
var params = this.id;
try {
const res = await deleteCategory(params);
if (res.data.state === '200') {
this.$router.push({ path: "/" });
}
} catch (error) {
console.error(error);
}
},
getId() {
this.id = this.$route.query.id;
},
getNewPage(val) {
this.currentPage = val;
},
async getArticleByPage() {
var params = {
currentPage: this.currentPage,
pageSize: this.pagesize,
categoryId: this.$route.query.id,
source: this.source,
parameter: this.parameter
};
try {
await getArticlePage(params);
} catch (error) {
console.error(error);
}
},
Articli_detail(item) {
this.$router.push({ path: "/articledetail", query: { id: item.id } });
},
async handleTop(item) {
var params = {
articleId: item.id,
categoryId: this.$route.query.id,
top: true
};
try {
await topArticle(params);
} catch (error) {
console.error(error);
}
}
},
watch: {
async currentPage() {
await this.getArticleByPage();
}
},
async beforeCreate() {
await this.getNewPage();
},
async created() {
await this.getId();
await this.getArticleByPage();
}
```
通过将异步操作使用async和await包裹,并使用try-catch语句处理错误,可以更清晰地编写异步代码。同时,将beforeCreated和created生命周期钩子函数声明为async,并使用await等待异步操作完成。