Js 新手，如何获取此请求的值？

Question

对不起，如果我措辞不好，但我有一些 js 行：

 var client = new XMLHttpRequest(); client.open('GET', '/test.txt'); client.onloadend = function() { alert(client.responseText); } client.send(); var x = document.getElementById("demo").innerHTML = x;

 <div id="demo"></div>

如何使 var x = 警报框的值？

Answer 1

 var client = new XMLHttpRequest(); client.open('GET', '/test.txt'); client.onload = e => { document.getElementById("demo").innerHTML = e.target.responseText); }; client.send(); var x = document.getElementById("demo").innerHTML = x;