Question

我正在构建一个module.exports = { (..) themeConfig: { (...), googleAnalytics: { trackingID: 'UA-GACODE-1', }, (...)应用。我的API组件包含一个我希望能够停止的异步调用。为此，我使用React Native：。

axios.CancelToken

从组件中，我致电const source = axios.CancelToken.source(); async getProductCategoriesRequest() { try { let response = await catalog.get(`category`, { cancelToken: source.token, }); return response.data; } catch (error) { if (axios.isCancel(error)) { console.log(error) return Promise.reject(); } } }上的requestCancellationHandler：

onPress

一切正常，除非除非重新加载应用程序，否则我无法打另一个电话。我在API请求捕获中不断收到const requestCancellationHandler = () => { source.cancel('API request is being canceled'); props.resetState(); };。简单的页面重新加载使我可以进行另一个异步调用

如何解决该问题而不必重新加载？

Answer 1

我认为Axios docs中的第二个示例会很有用。

<script>
       

        function showGraph()
        {
		var pageURL = window.location.href;
        var lastURLSegment = pageURL.substr(pageURL.lastIndexOf('/') + 1);
        console.log(lastURLSegment);
            {
                $.post("data.php?userid="+lastURLSegment,

                function (data)
                {                        
                    var name = [];
                    var marks = [];

                    for (var i in data) {
                        name.push(data[i].mydate);
                        marks.push(data[i].result);
                    }

                    var chartdata = {
                        labels: name,
                        datasets: [
                            {
                                label: 'Daily Profit',
                                backgroundColor: '#305882',
                                
                                hoverBackgroundColor: '#CCCCCC',
                                hoverBorderColor: '#666666',
                                data: marks
                            }
                        ]
                    };

                    var graphTarget = $("#graphCanvas");

                    var barGraph = new Chart(graphTarget, {
                        type: 'bar',
                        data: chartdata
                    });
                });
            }
        }
        </script>

对于您而言，

const CancelToken = axios.CancelToken;
let cancel;

axios.get('/user/12345', {
  cancelToken: new CancelToken(function executor(c) {
    // An executor function receives a cancel function as a parameter
    cancel = c;
  })
});

// cancel the request
cancel();

和

let source;

 async getProductCategoriesRequest() {
    source = axios.CancelToken.source();
    try {
      let response = await catalog.get(`category`, {
        cancelToken: source.token,
      });
      return response.data;
    } catch (error) {
      if (axios.isCancel(error)) {
        console.log(error)
        return Promise.reject();
      } 
    }
  }

使用axios.CancelToken之后如何进行异步调用？

1 个答案: