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task13.html
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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 buttonclick=document.getElementById("button");
var text=document.getElementById("aqi-input");
var display=document.getElementById("aqi-display");
buttonclick.onclick=function (){
if(text.value == null){
document.write("请输入天气信息");
}
else {
display.innerHTML=text.value;
}
}
})();
</script>
</body>
</html>