javascript - 出现错误时未调用 jQuery AJAX 错误回调

Question

我目前正在尝试对来 self 的服务器的 HTTP 413: Request entity too large 错误进行处理。我所做的是这样的:

$.ajax({
    url: "submit.php",
    data: {
        "data": POSTData
    },
    success: function(response, statusText, XHR) {
        console.log(XHR.status + ": " + response);
        resolve(); // resolve the promise and continue on with execution
    },
    // Added this part:
    error: function(response, statusText, XHR) {
        if(XHR.status === 413) {
            // Request entity too large
            // To solve this we split the data we want to upload into several smaller partitions
            // and upload them sequentially

            console.log("Error 413: Request entity too large. Splitting the data into partitions...");

            // handling code below

            // blahblahblah
        }
    },
    method: "POST"
});

但是我的控制台没有触发错误回调，而是仍然抛出错误(它说是 413)，就好像没有处理程序一样。我如何实现此功能？

Answer 1

错误回调的方法签名有误。参见 http://api.jquery.com/jquery.ajax/

根据这些文档，正确的签名是:函数(jqXHR jqXHR, String textStatus, String errorThrown)

因此在您的情况下 XHR.status 不存在，因为您所谓的 XHR 实际上是一个字符串。

试试这个:

 error: function (jqXHR, textStatus, errorThrown) {
    if(jqXHR.status === 413) {
        // Request entity too large
        // To solve this we split the data we want to upload into several smaller partitions
        // and upload them sequentially

        console.log("Error 413: Request entity too large. Splitting the data into partitions...");

        // handling code below

        // blahblahblah
    }
},

我强烈怀疑错误回调正在被调用，但是因为你没有在 if 语句之外的代码，所以你没有看到任何东西。