ajax同时重复请求2次，请问如何限制

Question

<script>
    function viewtopic(paymoney,_aid){
	   var dia=$.dialog({
	        title:'<center>查看权限</center>',
	        select:0,
	        content:'<center><p style="color:red;margin-top:5px;">支付'+paymoney+'积分</p></center>',
	        button:["确认支付","取消"]
	    });
	    dia.on("dialog:action",function(e){
	    	if(e.index==1){
	    		return false;
	    	}
	    	 var _tid=_aid;
			   $.ajax({
			        type:"POST",
			        url:"{url}",
			        data:{tid:_tid},
			        datatype: "text",//"xml", "html", "script", "json", "jsonp", "text".
			        success:function(data){
			        	data=$.trim(data);
			        	if(data==2){
			        		alert('先登录!');
			        	}
			        	if(data==1){
			        		window.location.reload();
			        	}
			        }   ,
			        error: function(){
			            //请求出错处理
			        }
			    });
	        // console.log(e.index)
	    });
	    dia.on("dialog:hide",function(e){
	       // console.log("dialog hide")
	    });
}
</script>

用的zepto.min.js，用户点击确认会出现同时2次的请求，导致每次都消耗2次积分。请问有没有什么办法可以限制同时重复的2次请求，在服务处理没用，是同时插入数据库，都没法做判断。

Answer 1

没用过这个dialog，理论上点击确定不会触发2次事件的，加下面黑色的控制试试

    function viewtopic(paymoney, _aid) {
      
        var dia = $.dialog({
            title: '<center>查看权限</center>',
            select: 0,
            content: '<center><p style="color:red;margin-top:5px;">支付' + paymoney + '积分</p></center>',
            button: ["确认支付", "取消"]
        });
        var loading = false;
        dia.on("dialog:action", function (e) {
            if (loading) return false;
            if (e.index == 1) {
                return false;
            }
            var _tid = _aid;
            loading = true;
            $.ajax({
                type: "POST",
                url: "{url}",
                data: { tid: _tid },
                datatype: "text",//"xml", "html", "script", "json", "jsonp", "text".
                success: function (data) {
                    loading = false;
                    data = $.trim(data);
                    if (data == 2) {
                        alert('先登录!');
                    }
                    if (data == 1) {
                        window.location.reload();
                    }
                },
                error: function () {
                    loading = false;
                    //请求出错处理
                }
            });
            // console.log(e.index)
        });
        dia.on("dialog:hide", function (e) {
            // console.log("dialog hide")