Ajax没有向PHP发送javascript变量(Ajax not sending javascript variable to PHP)

 我已经尽可能地使用下面的脚本，但我不能为我的生活解决为什么页面ID没有被发送到PHP脚本。 
 
 目前我正在使用PHP _GET命令抓取“index.php？id = 12”，然后将其插入到Javascript变量中。 我设置了第二个变量，包括它，以及纬度和经度的字符串。 当我测试字符串是通过警报创建的时，字符串看起来应该是它应该的样子。 
 
 在我的PHP脚本中，我只获取经度和纬度数据，但从不获取id数据。 在这里读了很多其他线程后，我相信Ajax期待一个对象，并且该字符串是意外的。 不幸的是我不知道如何纠正这个问题。 
 
 我的Javascript如下： 
 
    function GeoSuccess(position) {
    var id = <?php echo $id ?>; 
    var dataString = '?id='+id+'&action=geolocation&latitude='+position.coords.latitude+'&longitude='+position.coords.longitude; 

    $.ajax({
        url: 'search.php',
        type: 'GET',
        data: dataString,
        success: function (msg) {
        $('div#search-results').html(msg);
        },
        error: function (XMLHttpRequest, textStatus, errorThrown)
        {   
        alert('Error submitting request.'); 
        }

    });
}

I've gone as far as I can with the below script, but I can't for the life of me work out why the page id is not being sent to the PHP script.
 
Currently I'm grabbing the "index.php?id=12" with a PHP _GET command then inserting that into a Javascript variable. I set up a 2nd variable that includes that, as well as a string for latitude and longitude. When I test that the string is created via an alert, the string looks exactly like it should.
 
Inside my PHP script, I only every get the longitude and latitude data, but never the id data. Having read a number of other threads on here I believe the Ajax is expecting an object and that the string is unexpected. Unfortunately I do not know how to rectify this.
 
My Javascript is as follows:
 
    function GeoSuccess(position) {
    var id = <?php echo $id ?>; 
    var dataString = '?id='+id+'&action=geolocation&latitude='+position.coords.latitude+'&longitude='+position.coords.longitude; 

    $.ajax({
        url: 'search.php',
        type: 'GET',
        data: dataString,
        success: function (msg) {
        $('div#search-results').html(msg);
        },
        error: function (XMLHttpRequest, textStatus, errorThrown)
        {   
        alert('Error submitting request.'); 
        }

    });
}

原文：https://stackoverflow.com/questions/9564231