How to get Ajax return data in jquery

It is important to note that this Ajax request must be synchronous if you want to get the value returned by Ajax, otherwise it will not get the return value function getpagetotalanddatatotal (page) {        // Set a variable to receive the value returned by ajax var pagetotal = 0;//Gets the number of pages with the total data $.ajax ({URL: "Your URL address", type: "Post", Async:false,data: {},datatype: " JSON ", success:function (data) {pagetotal = Data.pagetotal;}}); return pagetotal;}

How to get Ajax return data in jquery