semlinker/index.html

## index.html
<!DOCTYPE html>
<html lang="zh-cn">
  <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>Axios 取消重复请求示例</title>
    <script src="https://cdn.bootcdn.net/ajax/libs/qs/6.9.6/qs.min.js"></script>
    <script src="https://cdn.bootcdn.net/ajax/libs/axios/0.21.1/axios.min.js"></script>
  </head>
  <body>
    <h3>Axios 取消重复请求示例</h3>
    <button onclick="sendRequest()">发起请求</button>
    <script>
      const pendingRequest = new Map();

      function generateReqKey(config) {
        const { method, url, params, data } = config;
        return [method, url, Qs.stringify(params), Qs.stringify(data)].join(
          "&"
        );
      }

      function addPendingRequest(config) {
        const requestKey = generateReqKey(config);
        config.cancelToken =
          config.cancelToken ||
          new axios.CancelToken((cancel) => {
            if (!pendingRequest.has(requestKey)) {
              pendingRequest.set(requestKey, cancel);
            }
          });
      }

      function removePendingRequest(config) {
        const requestKey = generateReqKey(config);
        if (pendingRequest.has(requestKey)) {
          const cancel = pendingRequest.get(requestKey);
          cancel(requestKey);
          pendingRequest.delete(requestKey);
        }
      }

      axios.interceptors.request.use(
        function (config) {
          removePendingRequest(config); // 检查是否存在重复请求，若存在则取消已发的请求
          addPendingRequest(config); // 把当前请求添加到pendingRequest对象中
          return config;
        },
        (error) => {
          return Promise.reject(error);
        }
      );

      axios.interceptors.response.use(
        (response) => {
          removePendingRequest(response.config); // 从pendingRequest对象中移除请求
          return response;
        },
        (error) => {
          removePendingRequest(error.config || {}); // 从pendingRequest对象中移除请求
          if (axios.isCancel(error)) {
            console.log("已取消的重复请求：" + error.message);
          } else {
            // 添加异常处理
          }
          return Promise.reject(error);
        }
      );

      async function sendRequest() {
        console.dir(pendingRequest);
        const response = await axios.get(
          "https://jsonplaceholder.typicode.com/todos/1"
          //   "https://localhost:3000/todos/1"
        );
        console.log(response.data);
      }
    </script>
  </body>
</html>
	<!DOCTYPE html>
	<html lang="zh-cn">
	<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>Axios 取消重复请求示例</title>
	<script src="https://cdn.bootcdn.net/ajax/libs/qs/6.9.6/qs.min.js"></script>
	<script src="https://cdn.bootcdn.net/ajax/libs/axios/0.21.1/axios.min.js"></script>
	</head>
	<body>
	<h3>Axios 取消重复请求示例</h3>
	<button onclick="sendRequest()">发起请求</button>
	<script>
	const pendingRequest = new Map();

	function generateReqKey(config) {
	const { method, url, params, data } = config;
	return [method, url, Qs.stringify(params), Qs.stringify(data)].join(
	"&"
	);
	}

	function addPendingRequest(config) {
	const requestKey = generateReqKey(config);
	config.cancelToken =
	config.cancelToken \|\|
	new axios.CancelToken((cancel) => {
	if (!pendingRequest.has(requestKey)) {
	pendingRequest.set(requestKey, cancel);
	}
	});
	}

	function removePendingRequest(config) {
	const requestKey = generateReqKey(config);
	if (pendingRequest.has(requestKey)) {
	const cancel = pendingRequest.get(requestKey);
	cancel(requestKey);
	pendingRequest.delete(requestKey);
	}
	}

	axios.interceptors.request.use(
	function (config) {
	removePendingRequest(config); // 检查是否存在重复请求，若存在则取消已发的请求
	addPendingRequest(config); // 把当前请求添加到pendingRequest对象中
	return config;
	},
	(error) => {
	return Promise.reject(error);
	}
	);

	axios.interceptors.response.use(
	(response) => {
	removePendingRequest(response.config); // 从pendingRequest对象中移除请求
	return response;
	},
	(error) => {
	removePendingRequest(error.config \|\| {}); // 从pendingRequest对象中移除请求
	if (axios.isCancel(error)) {
	console.log("已取消的重复请求：" + error.message);
	} else {
	// 添加异常处理
	}
	return Promise.reject(error);
	}
	);

	async function sendRequest() {
	console.dir(pendingRequest);
	const response = await axios.get(
	"https://jsonplaceholder.typicode.com/todos/1"
	// "https://localhost:3000/todos/1"
	);
	console.log(response.data);
	}
	</script>
	</body>
	</html>