页面上的输入，记录
<!DOCTYPE html>
<html>
<head>
<meta charset="GBK-8">
<title>对话框</title>
</head>
<body>
<input type="text" name="shuru">
<button name="tijiao">发送</button>
<ul></ul>
<script>
var shuru=document.getElementsByName('shuru')[0];
var tijiao=document.getElementsByName('tijiao')[0];
var ul=document.getElementsByTagName('ul')[0];
tijiao.onclick=function(){
var li=document.createElement('li');
li.innerHTML = shuru.value;
ul.appendChild(li);
shuru.value='';
}
</script>
</body>
</html>