关于php：在javascript函数中设置变量

Setting the variable in javascript function

我在设置变量值时遇到问题。我的代码如下。

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function fpform(){
var response_new = '';
var password_reset ="";
var fpemail = $('#frgtpwd').val();
//var fpemail = document.getElementById('frgtpwd').value;

if (fpemail ==""){
$('span#fperror').text("insert your emal address");
//document.getElementById('fperror').innerHTML ="Insert your email address";
password_reset = 'no';
} else {
var filter = /^([a-zA-Z0-9_\.\-])+\@(([a-zA-Z0-9\-])+\.)+([a-zA-Z0-9]{2,4})+$/;
if (filter.test(fpemail)==false) {
$('span#fperror').text("Email address is not in valid format");
//document.getElementById('fperror').innerHTML ="Email address is not in valid format";
password_reset = 'no';
} else {
$("#loader").html('<img src="images/ajax-loader.gif" />');
$.post("forgot_password_process.php", {
email:fpemail
}, function(response){
response_new = response.trim();
}).success(function () {
if (response_new == 'yes'){
$("#fperror").html('<font color="green">Your password has been reset now and emailed to you </font>');
$("#loader").empty();
password_reset = 'yes';
} else {
$("#loader").empty();
$("#fperror").html('<font color="black"> Email address was not found in database!</font>');
password_reset = 'no';
}
});
}
}

if (password_reset =="yes"){
alert(password_reset);
return true;
} else {
alert(password_reset);
return true;
}
}

最后一个if条件是检查password_reset变量是否设置为yes，并根据该值返回true或false。但警报显示password_reset变量的空白值。我似乎无法找到这背后的问题，因为在到达最后一个if之前应该分配password_reset变量。任何人都可以建议解决方案。

亲切的问候