php - Echo Ajax - PHP、AJAX、Jquery

Question

目前，我的代码中遇到了一个令人沮丧的错误。看来我无法在 php 中回显 ajax 调用。下面是调用的代码。任何建议将不胜感激，谢谢。

echo'
<script>
$.get("fxn.php", { r: ""+result, id:""+'.$id.' } ).
    success(function(){ 
       alert("FXN"); 
    });
</script>';

注意:

1. 结果是一个 JavaScript 变量。
2. $id 是一个 PHP 变量。
3. 成功函数永远不会被调用。

Answer 1

// For those who come after, put a space after echo.
echo 
     // put type into your script tag. Be kind to the older browsers.
     '<script type="text/javascript">'.
     // are you sure jQuery has loaded at this point? Does `$` reference jQuery
     // or is there another framework that's nastying up $? (Liferay? Prototype?)
     '$.get("fxn.php", '.
     // I always prefer explicit casting, but is this defined?
     '{ r: ""+result, id:""+'
     // is $id a string? Then you need to quote it.
     .$id.' } ).'.
     // not necessary, but good practice, use the third parameter of `$.get`
     // instead of defining it externally.
     'success(function() { alert("FXN"); });</script>';

建议的替代方案:

echo '<script type="text/javascript">
         $.get("fxn.php", { r: String(result), id:"'.$id.'" }, function() { 
            alert("FXN"); 
         });
     </script>';

哦，您确定 PHP 正在返回任何内容吗？如果您在 fxn.php 上手动使用 get 会发生什么？