如何使用 ajax 调用 name onkey up?

how to call name onkey up using ajax?

我是 ajax 的新手。我想根据 onkey up 从数据库中获取名称,但我在控制台 "Invalid left-hand side in assignment" 中收到此错误。当我输入它时显示 "showname function is not defined".? 这是我的代码。 搜索:

This is myscript
function showname(d) {
        var xhttp;
        if (window.XMLHttpRequest) {
            xhttp= new XMLHttpRequest();
        }else{
            xhttp = new ActiveXObject("Microsoft.XMLHTTP");
        }
        xhttp.onreadystatechange = function() {
        if (xhttp.readyState == 4 && xhttp.status == 200) {
        document.getElementById("demo").innerHTML = xhttp.responseText;
           }
          };
          xhttp.open("POST", "ajax2.php?name"=+d, true);
          xhttp.send();
    }
this ajax2.php code

$name = $_GET["name"];
$db = new mysqli("localhost", "root", "", "customername");
$conn = $db->query("select customerName from customers like '".$name."%'");
$fetch = $conn->fetch_array();

?>
<?php foreach ($fetch as $key => $value) :?>
    <p><?php echo $value ?></p>
<?php endforeach; ?>

提前致谢。

xhttp.open("POST", "ajax2.php?name"=+d, 真);

我想你打错了,把 = 放在引号里。

xhttp.open("POST", "ajax2.php?name=" + d, true);