如何防止表单重复提交？

如何防止表单重复提交？

       $.ajax({
            type:"POST",
            url:"${ctx}/sku/saveMultiSpe",
            data:{
                specificationName:specificationName,
                classifyId:classifyId,
                multiSpeId:multiSpeId,
            },
            beforeSend: function () {
                // 禁用按钮防止重复提交
                $("#bannerSummitOK").attr({ disabled: "disabled" });
                $("#bannerSummitOK").css("background","#777");
            },
            success:function(data){
                if(data=="SUCCESS"){
                	alert("保存成功");
                    location.href="${ctx}/sku/index?";
                }else if(data=="DATAEXIST"){
                	alert("该分类下的数据已存在");
                	 location.href="${ctx}/sku/index?";
                }else{
                    alert("保存失败");
                }
            },
           
            error:function(data){
                alert("保存出错");
            },
            complete: function () {
                $("#bannerSummitOK").removeAttr("disabled");
                $("#bannerSummitOK").css("background","#3071a9");
            },
        });