Hello Dinesh,
You can use jquery as follow:
var personObj = {name: "Imdad", phonenumber: "91"};
var onAddUserSuccess= function(returnData) {
};
$.ajax({
type: "POST",
url: "Users.aspx/AddPerson",
data: personObj,
contentType: "application/json; charset=utf-8",
dataType: "json",
success: onAddUserSuccess
});