<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8" />
<title>Document</title>
<script type="text/javascript">
function getVal(){
var newAdd=document.getElementById('newAdd').value;
document.getElementById('txtVal').innerHTML+=newAdd;
}
</script>
</head>
<body>
<input type="text" name="" id="newAdd" />
<input type="button" onclick="getVal()" value="添加" />
<div id="txtVal"></div>
</body>
</html>