1.1 button点击事件

<div class="clickShowInfoFuc">
    <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>
</div>

  button{
            width:100px;
            height:25px;
        }
        div{
            width:200px;
            margin:0px auto;
            margin-top:20px;
        }

window.onload=function(){
    var btn= document.getElementById("button");
    btn.onclick=function(){
        var v1=document.getElementById("aqi-input").value;
        document.getElementById("aqi-display").innerHTML=v1;
    };
};