如何使用jquery对PHP文件进行onclick ajax调用？

从jQuery文档中：http :
//api.jquery.com/jQuery.ajax/

function addHit(data1, data2){    $.ajax({       type: "POST",       url: "http://domain.com/counter.php",       data: "var1=data1&var2=data2",       success: function(msg){         alert( "Data Saved: " + msg ); //Anything you want       }     });}