javascript - 在导航到另一个页面之前，如何确保函数已完全执行？

Question

我正在使用网络服务删除某些记录。 jquery ajax请求写在超链接的onclick中。当我使用 firebug 逐行执行脚本时，它会被删除，否则不会。有人遇到过这样的情况吗？请帮忙

代码示例:

 $(".target").click(function() { 
            func();  //This function should be executed completely before navigating to another page
        });


 var func = function() {
            var items = $("#flag").find('td input.itemClass');
            id = items[0].value;
            var status = items[1].value;
            var type = items[2].value;
            var params = '{' +
                            'ID:"' + id + '" ,Type:"' + type + '" ,Status:"' + status + '"}';
            $.ajax({
                type: "POST",
                url: "WebMethodService.asmx/DeleteItem",
                data: params,
                //contentType: "plain/text",
                contentType: "application/json; charset=utf-8",
                dataType: "json",
                success: function(msg) {
                    $("#deleteNotificationMessage").val("Item has been removed"); // keep a separate label to display this message
                }

                //Event that'll be fired on Success

            });


    }

Answer 1

jQuery ajax 函数返回延迟对象，因此我们返回$.ajax。那么你应该使用延迟。 done当 AJAX 完全完成时执行回调。当 AJAX 完成后，使用 JS 导航离开:

var func = function() {
    ...
    return $.ajax({...});                   //return our ajax deferred
}

$(".target").click(function() { 
    var target = this;                      //preserve "this" since this in the callback may be different 
    func().done(function(){                 //our done callback executed when ajax is done
        window.location.href = target.href; //assuming .target is a link
    });
    return false;                           //prevent the natural click action
});