问调用cvm.tencentcloudapi.com的api时提示跨域问题。是腾讯云不允许跨域访问吗？

var xhr=new XMLHttpRequest()
xhr.open("get","https://cvm.tencentcloudapi.com/?Limit=10&Offset=0",true)
xhr.setRequestHeader("Content-type","application/x-www-form-urlencoded");
xhr.setRequestHeader("Authorization","*");
xhr.setRequestHeader("Host","cvm.tencentcloudapi.com");
xhr.setRequestHeader("X-TC-Action","DescribeInstances");
xhr.setRequestHeader("X-TC-Version","2017-03-12");
xhr.setRequestHeader("X-TC-Timestamp","1605437266");
xhr.setRequestHeader("X-TC-Region","ap-guangzhou");
xhr.onreadystatechange=function(){
	if(xhr.readyState===4&&xhr.status==200){
		console.log(xhr.responseText);
	}
}	
xhr.send(null)