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<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>
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原文地址:http://www.cnblogs.com/wangqiang4518/p/5724253.html