<html>
<head>
<title>获取文本框中的value</title>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<script language="javascript">
function getUsername(){
//思路:获取文本框节点;获取文本框节点的value
//通过元素的id获取元素节点
//document内置对象,属于DOM对象,一下变成属于DOM编程
var usernameInput = document.getElementById("username");
//input文本框中有value属性,所以可以使用这种语法:元素对象.value
var username = usernameInput.value;
alert(username);
}
</script>
</head>
<body>
<input type = "text" id = "username" />
<input type = "button" value = "提交" onclick = "getUsername();"/>
</body>
</html>
</html>