调用api函数发送请求,若5秒后未请求成功,则调用warning函数发出警告。使用javascript编程实现
时间: 2024-06-10 07:06:45 浏览: 14
好的,我可以为您提供帮助。以下是参考代码:
```javascript
function sendRequest() {
var request = new XMLHttpRequest();
var url = "https://example.com/api"; // 替换为您的API地址
request.open('GET', url);
setTimeout(function() {
if (request.readyState !== 4) { // 如果请求未完成
warning();
request.abort(); // 终止请求
}
}, 5000); // 5秒后调用warning函数
request.onreadystatechange = function() {
if (this.readyState == 4 && this.status == 200) {
// 请求成功
// 在这里处理API返回的数据
}
};
request.send();
}
function warning() {
alert("请求超时,请稍后再试!");
}
```
您可以根据实际情况修改代码中的URL和warning函数。
相关问题
调用api函数发送请求,若5秒后未请求成功,则调用warning函数发出警告。其中,api函数在请求成功的情况下会返回一个promise使用javascript编程实现
Sure, here is a possible implementation using JavaScript:
```
function sendRequestWithTimeout(apiFunction, timeout) {
let timeoutId;
const promise = new Promise((resolve, reject) => {
// Set timeout
timeoutId = setTimeout(() => {
reject('Request timed out');
}, timeout);
// Call API function
apiFunction().then((response) => {
resolve(response);
}).catch((error) => {
reject(error);
});
});
// Cancel timeout when request is fulfilled
promise.finally(() => clearTimeout(timeoutId));
return promise;
}
function apiFunction() {
// Call API function here and return a Promise
}
function warning() {
// Show warning message or take any other action
}
sendRequestWithTimeout(apiFunction, 5000).then((response) => {
// Handle successful response here
}).catch((error) => {
if (error === 'Request timed out') {
warning();
} else {
// Handle other errors
}
});
```
In the above code, `sendRequestWithTimeout` is a wrapper function that takes an `apiFunction` and a `timeout` in milliseconds. It returns a Promise that resolves with the response if the `apiFunction` is successful within the timeout period, or rejects with an error message if the `apiFunction` fails or takes longer than the timeout period. The timeout is implemented using `setTimeout`, and is cancelled when the Promise is fulfilled (whether resolved or rejected).
You can use this function to wrap any API function that returns a Promise, like so:
```
sendRequestWithTimeout(() => fetch('https://example.com/api/data'), 5000)
```
Note that this code doesn't make any requests or handle any warnings directly, it only provides a reusable function to wrap API calls with a timeout. You'll need to adapt it to your specific use case by replacing `apiFunction` and `warning` with your own implementations.
el-upload上传文件成功后调用查询列表的方法,更新列表,代码说明
假设你是使用Element UI中的el-upload组件进行文件上传,上传成功后需要调用一个查询列表的方法来更新列表,那么可以按照以下步骤来进行操作:
1. 在el-upload组件中添加一个上传成功的钩子函数,例如:
```html
<el-upload
class="upload-demo"
action="/your-upload-api"
:on-success="handleUploadSuccess">
<el-button slot="trigger" type="primary">选取文件</el-button>
<el-button slot="tip" type="warning" icon="el-icon-info">只能上传jpg/png文件,且不超过500kb</el-button>
</el-upload>
```
2. 在Vue实例中定义handleUploadSuccess方法来处理上传成功后的逻辑,例如:
```javascript
export default {
data() {
return {
fileList: [] // 文件列表
};
},
methods: {
handleUploadSuccess(response, file, fileList) {
// 上传成功后更新文件列表
this.fileList = fileList;
// 调用查询列表的方法来更新列表
this.fetchList();
},
fetchList() {
// 查询列表的方法
// ...
}
}
};
```
在handleUploadSuccess方法中,我们首先更新了文件列表this.fileList,然后调用了查询列表的方法this.fetchList来更新列表。具体的查询列表方法实现可以根据你的具体场景来编写。
这样,当文件上传成功后,就会自动调用handleUploadSuccess方法来更新列表了。
相关推荐
![zip](https://img-home.csdnimg.cn/images/20210720083736.png)
![zip](https://img-home.csdnimg.cn/images/20210720083736.png)
![pdf](https://img-home.csdnimg.cn/images/20210720083512.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)