2019独角兽企业重金招聘Python工程师标准>>> 
每隔2秒通过ajax请求，更新未读消息数量
<script>
$(function () {
var user = "{$userid}";
var timerID = setInterval("$.referesh1()", 1000 *15);
$.extend({
referesh1: function () {
$.ajax({
type:"post",
url :"{:U('Index/wmessages')}",
data: {"user":user},
datatype:"json",
success:function(json){
if(json != 0){
$(".wmessage").show();
$(".shuliang").html(json);
}else {
$(".wmessage").hide();
}
},
error: function() {
clearInterval(timerID);
}
})
}
});
//iCount获取setInterval句柄
/*var iCount = setInterval(GetBack, 3000);
function GetBack() {
alert("aa");
}
//id为cOk绑定点击事件
$("#cOk").click(function (e) {
//清除setInterval
clearInterval(iCount);
});*/
});
</script>