XMLHttpRequest responseType = "json";给出错误 SYNTAX_E

问题描述

我无法将 XHR responseType 设置为json".如果我将其保留为空字符串 xml.responseType = ""; 会正常工作，但是当我将其设置为json"时，我会收到控制台错误消息 SYNTAX_ERR: DOM Exception 12.

I am having trouble setting the XHR responseType to "json". It works fine if I leave it an empty string xml.responseType = ""; but when I set it to "json" I get the console error message SYNTAX_ERR: DOM Exception 12.

.js 文件:

var xml = new XMLHttpRequest();
xml.open("GET", "test.php", true);
xml.responseType = "json";
xml.send();

.php 文件:

<?php
$foo = "{"key1":"val1", "key2":"val2"}";
echo $foo;
?>

不知道发生了什么……有什么想法吗?

Not sure what's going on.. Any ideas?

推荐答案

responseType 对象的 XMLHttpRequest 属性已添加到其新变体 XMLHttpRequest Level 2 并且包含在 HTML 5 中，我不确定所有浏览器都支持这种方法，所以您使用的浏览器可能没有实现该方法

responseType property for XMLHttpRequest object is added in its new variant XMLHttpRequest Level 2 and which is included in HTML 5, i am not sure all browsers support this method so it could be possible that you are using a browser which doesn't implement that method

您可以使用以下代码来获取所需格式的数据，而不是使用 responseType

instead of using responseType you can use following code to get data in desired format

 var xml = new XMLHttpRequest();
 xml.open("GET", "test.php", true);

 xml.onreadystatechange = function() {
   if (xml.readyState != 4)  { return; }

   var serverResponse = JSON.parse(xml.responseText);
 };

 xml.send(null);

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