javascript - jquery中如何进行轮询？

Question

我有一个邮政电话。结果之后我想做另一个 get CALL 来检查状态。但仅状态为“已完成”。

jQuery.ajax({
        type: "POST",
        contentType: "application/json",
        url: "/doPostURL....,
        headers: {
            "x-csrf-token": sCsrftoken
        },
        success: function() {
        .. now I want to do the polling on the status
         jQuery.ajax({
            type: "GET",
            dataType: "json",
            url: "/getStatusUrl ,
            success: function(data, textStatus, response) {
        // to continue only if status if Finished 
            },
            error: function() {
            }
        });
    }
});

Answer 1

$.ajax 返回一个延迟对象。

您可以执行如下操作。更多信息here

var doSomething = $.ajax({
  url: '/path/to/file',
  type: 'default GET (Other values: POST)',
  dataType: 'default: Intelligent Guess (Other values: xml, json, script, or html)',
  data: {param1: 'value1'},
})
function doneCallback(){
  // Handle exit condition here.
  doSomething();
}
function failCallback(){
  // Handle failure scenario here.
}
doSomething.then(doneCallback, failCallback)