jQuery的Ajax时无响应数据的解决方法

$.Ajax(
{
type: "post",
url: "/MEmberComment.aspx/getOrderToBeCommentCount",
success: function(result) {
//ToDo:
}
)

$.ajax(
{
type: "POST",
contentType: "APPlication/json",
url: "/MemberComment.aspx/GetOrderToBeCommentCount",
data:"{a:'a'}",
success: function(result) {
//ToDo:
}
)