The Ajax return value to the upper function method.

function Load_val (callback) {//define a callback function$.getjson ('test.php', function (DAT) {callback (data);//returns the returned result as a parameter    });} Load_val (function (data) {alert (data);//Here you can get the value}); //Otherwise, you need to do this with synchronous Ajax.function Load_val2 () {varresult; $.ajax ({dataType:'JSON', URL:'test.php',        Async:false,//here to choose the async to False, then this program executes here will pause, wait for//data loading is complete before continuingsuccess:function (data) {result=data;    }    }); returnresult;} vardata = Load_val ();//you can get the data directly here .

The Ajax return value to the upper function method.