是否可以中止数据类型为json的jquery $ .ajax请求？

Question

I want cancel jquery $.ajax call request with datatype json on window unload event. I tried doing this and it is throwing error on xhr.abort(); line.

var xhr = $.ajax({         
    type: "POST",
    url: serviceUrl,
    dataType: "text json",
    data: ajaxParameters,
    async: true,
    contentType: "application/json; charset=utf-8",
    error: function(request, status, error) {
    },
    complete: function(e, xhr, settings) {                      
    }
});

$(window).onunload = function(){
    xhr.abort();
}

Answer 1

Try this out...

// Global variable
var xhr;

xhr = $.ajax({         
    type: "POST",
    url: serviceUrl,
    dataType: "text json",
    data: ajaxParameters,
    async: true,
    contentType: "application/json; charset=utf-8",
    error: function(request, status, error) {
    },
    complete: function(e, xhr, settings) {                      
    }
});

$('body').on('beforeunload',function(){
    xhr.abort();
}