I'm trying to practice using AJAX with jQuery, but when I am trying to call the XML file I get an error saying 'Junk after document element'. The line it is pointing to is number 3, but I don't see anything wrong with line 3. I'm trying to practice using AJAX with jQuery,
阅读背景：
AJAX请求中的“文档元素之后的垃圾”错误
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