两个文本框的值添加后自动获取值

 1 <script>
 2         function show() {
 3             var a1 = document.getElementById("a1");
 4             var a2 = document.getElementById("a2");
 5             var show = document.getElementById("show");
 6             show.innerHTML = "a1的值是：" + a1.value + "; a2的值是: " + a2.value;
 7         }
 8     </script>
 9  <input name="a1" type="text" id="a1" onchange="show()" />
10     <input name="a2" type="text" id="a2" />
11     <input type="button" name="Submit" value="按钮" onclick="show();" />
12     <div id="show"></div>