Ajax获取数据时出现XMLHttpRequest cannot load

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报错内容：

Cross origin requests are only supported for protocol schemes: http, data, chrome, chrome-extension, https, chrome-extension-resource.

解决方案：

一、换火狐浏览器测试

二、将测试内容放到本地服务器，如：Tomcat上。

我的代码：（同时在同级目录下新建一个名为test.txt的文档,即可看到持续打印文档内的内容）

<!DOCTYPE html><html lang="en"><head><meta charset="UTF-8"><title>autoUpdate</title><script>var xmlhttp;function populateList(){var url = 'test.txt';xmlhttp.open('GET',url,true);xmlhttp.onreadystatechange = processResponse;xmlhttp.send(null);}function processResponse(){if(xmlhttp.readyState == 4 && xmlhttp.status == 200){var li = document.createElement("li");var txt = document.createTextNode(xmlhttp.responseText);li.appendChild(txt);document.getElementById("update").appendChild(li);setTimeout(populateList,1000);}else if(xmlhttp.readyState == 4 && xmlhttp.status != 200){console.log(xmlhttp.responseText);}}window.onload = function(){xmlhttp = new XMLHttpRequest();populateList();}</script></head><body><div id="update"></div></body></html>

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