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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>IFE JavaScript Task 01</title>
</head>
<body>
<label>请输入北京今天空气质量:<input id="aqi-input" type="text"></label>
<button id="button">确认填写</button>
<div>您输入的值是:<span id="aqi-display">尚无录入</span></div>
<script type="text/javascript">
(function () {
/*
在注释下方写下代码
给按钮button绑定一个点击事件
在事件处理函数中
获取aqi-input输入的值,并显示在aqi-display中
*/
var btn = document.getElementById("button");
var input = document.getElementById("aqi-input");
var display = document.getElementById("aqi-display");
btn.onclick = function () {
if (input.value) {
display.innerHTML = input.value;
}
else {
alert("请输入");
}
}
})();
</script>
</body>
</html>