console 命令行工具 X clear

console

function loadDoc() {
  var xhttp = new XMLHttpRequest();
  xhttp.onreadystatechange = function() {
    if (this.readyState == 4 && this.status == 200) {
      document.getElementById("demo").innerHTML =this.responseText;
    }
  };
  xhttp.open("GET", "https://www.w3school.com.cn/js/js_ajax_examples.asp", true);
  xhttp.send();
}

<!DOCTYPE html>
<html>

<style>
	#main {
		width: 800px;
		height: 400px;
		margin: 50px auto;
</style>

<head>
	<meta charset="utf-8">
	<title>文档标题</title>
	<div class="main">
		<div id="map"></div>


	</div>
</head>

<body>

</body>

</html>