请问如何用纯javascript获取相对位置的文件内容？
我查了半天，找到一个使用XMLHttpRequest+get的方法
var req=new XMLHttpRequest()
req.open("get","1.txt")
req.send(null)
// if(req.status==200)
console.log(req.responseText)
但是本地测试发现开发者工具说
origin 'null' has been blocked by CORS policy: Cross origin requests are only supported for protocol schemes: http, data, chrome-extension, edge, https, chrome-untrusted.
查了下，没有获得解决方法，特来求助
