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web网站点击下载按钮后,到出现保存界面中间怎么给用户一个提示

我用asp.net开发了个web网站,在下载的时候,如果是在美国那边,点击save的button.直到出现Save as的那个窗口要很长一段时间,我想在这中间加个提示,告诉用户,程序正在进行呢.
求思路,求解决. --------------------编程问答-------------------- ajax蒙版效果??? --------------------编程问答--------------------

                $.ajax({
                    url: "",
                    type: "post",
                    contentType: "application/json",
                    data: "",
                    dataType: "json",
                    beforeSend: function () {
                       //loading... 显示 
                    },
                    complete: function () {
//loading... 显示
                    },
                    success: function (data) {
                    
                    }
                });
--------------------编程问答--------------------

                $.ajax({
                    url: "",
                    type: "post",
                    contentType: "application/json",
                    data: "",
                    dataType: "json",
                    beforeSend: function () {
                       //loading... 显示 
                    },
                    complete: function () {
                       //loading... 隐藏....
                    },
                    success: function (data) {
                     
                    }
                });
--------------------编程问答-------------------- 可以在beforeSend: function () {
                       //loading... 显示 
                    },
里面插入一张动画图片,成功后取消 --------------------编程问答--------------------
引用 3 楼 a346729576 的回复:
JavaScript code?12345678910111213141516                $.ajax({                    url: "",                    type: "post",                    contentType: "application/json",           ……



sorry,我想可能是我没有描述清楚,     
我要做的,是在1.点击下载按钮后,2.________3.到出现下载窗口(提示是否保存)这中间的2这里出现一个提示. --------------------编程问答--------------------
引用 5 楼 vvnet88 的回复:
引用 3 楼 a346729576 的回复:JavaScript code?12345678910111213141516                $.ajax({                    url: "",                    type: "post",                    contentType: "applica……
不就是缓冲的效果吗? --------------------编程问答--------------------
引用 6 楼 a346729576 的回复:
引用 5 楼 vvnet88 的回复:引用 3 楼 a346729576 的回复:JavaScript code?12345678910111213141516                $.ajax({                    url: "",                    type: "post",                    co……



是的呀,但是我去看了您提供的ajax-function的使用方法,感觉应该不是我要的效果吧,最起码我是没想清楚该怎么用上去会达到我说的那个效果,求解...
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