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http-request
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7-重复请求问题.html

<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title></title>
    <style>
        #result {
            margin: 0 auto;
            width: 200px;
            height: 300px;
            background-color: aquamarine;
        }
    </style>
</head>

<body>
    <button>发送请求</button>
    <div id="result">

    </div>
    <script>
        const btns = document.querySelectorAll('button');
        let x = null;
        let isSending = 1;
        btns[0].onclick = function() {
            if (isSending == 3) {
                x.abort();
            } //请求标配
            else {
                x = new XMLHttpRequest();
                x.open('GET', 'http://127.0.0.1:1000/delay');
                x.send();
                x.onreadystatechange = function() {
                    if (x.readyState == 4) {
                        isSending += 1;
                    }
                }
            }
        }
    </script>
</body>

</html>