Why is request.status=0? There is no problem with php and browser return.

request.status=0, has checked several times and found nothing wrong. The code screenshot is as follows 
<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
  <title>Document</title>
</head>
<style>
p {
  color:-sharpff0000;
}
</style>
<body>
<h1></h1>
<label for="">:</label>
<input type="text" id="keyword">
<button id="search"></button>
<p id="searchResult">



<script type="text/javascript">
  document.getElementById("search").onclick = function() {
    var request = new XMLHttpRequest();
    request.open("GET","http://t.com/ajax/server.php?number=" + document.getElementById("keyword").value);
    request.send();
    request.onreadystatechange = function() {
      if (request.readyState === 4) {
        if(request.status == 200) {
          document.getElementById("searchResult").innerHtml = request.responseText;
        } else {
          alert(":request.status=" + request.status);
        }
      } else {
          alert("request.readyState=" + request.readyState);
      }
    }
  }
</script>
</body>
</html>

Ajax
Jul.30,2021

is cross-domain. Have you ignored 2 red error as big as the console?
the solution is nothing more than jsonp or server configuration to allow cross-domain, self-search engine

code I copied once, created a new folder, and then restarted the wampp, problem is gone, but innerHtml is invalid, innerText can, do not understand ah

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