1、<input type="button" onclick="showInfo(this)" value="点击">
2、 function people(name,age) {
this.name=name;
this.age=age;
}
3、<input type="button" id="box" value="点击">
<script type="text/javascript">
var box1=document.getElementById("box")
box1.onclick=function(){
alert(this.value); //按钮元素
}