防重复导出，点击后按钮置灰，一定时间后可再次点击

// 将所有button置为disabled，定时将上面disabled button复原
$("#outRate_export:button:not(:disabled)").attr("di","di").attr("disabled",true).css("background-color", "#c2c2c2");
setTimeout(function(){$("#outRate_export:button[di=di]").attr("disabled",false).removeAttr("di").css("background-color", "#3091d1");},4000);