实现效果图
<html>
<head>
<script language="javascript">
function print(){
var a=document.getElementById("test").value;
alert(a);
}
</script>
</head>
<body>
<form>
<input type="text" name="name" id="test" />
<input type="button" name="button" value="获取" onclick="print()" />
</form>
</body>
</html>