代码示例:(标识:json_ajax)
<!DOCTYPE html>
<html>
<body>

<h1>使用 XMLHttpRequest 获取 JSON 文件</h1>
<p id="demo"></p>

<script>
const xmlhttp = new XMLHttpRequest();
xmlhttp.onload = function() {
  const myObj = JSON.parse(this.responseText);
  document.getElementById("demo").innerHTML = myObj.name;
}
xmlhttp.open("GET", "/static/demo/txt/json.txt");
xmlhttp.send();
</script>

</body>
</html>
运行结果: