ife-js-task/task13.html at master · glt18/ife-js-task · GitHub

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<!DOCTYPE html>
<html>
<head>
    <meta charset="utf-8">
    <title>Task 13</title>
</head>
<body>
    <label>请输入请输入北京今天空气质量：<input type="text" id="aqiInput"></label>
    <input type="button" id="btn" value="确认填写">
    <div>你输入的值是：<span id="aqiDisplay">尚未输入！</span></div>
    <script type="text/javascript">
        var todayAq = document.getElementById('aqiInput');
        var printTodayAq = document.getElementById('aqiDisplay');
        var button = document.getElementById('btn');
        button.onclick = function () {
            if (todayAq.value != "") {
            printTodayAq.innerHTML = todayAq.value;
            }  else {
            printTodayAq.innerHTML = "请输入！";
            }
        };
    </script>
</body>
</html>