原生ajax代码
<!DOCTYPE html><html><body>
<h1>XMLHttpRequest 对象</h1>
<p id="demo">让 AJAX 更改这段文本。</p>
<button type="button">更改内容</button>
<script>
function loadDoc() {
var xhttp = new XMLHttpRequest();
xhttp.open("GET", "/demo/js/ajax_info.txt", false);
xhttp.send();
document.getElementById("demo").innerHTML = xhttp.responseText;
}
</script>
</body>
</html>
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