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使用表单标签,与用户交互

网站怎样与用户进行交互?答案是使用HTML表单(form)。表单是可以把浏览者输入的数据传送到服务器端,这样服务器端程序就可以处理表单传过来的数据。

语法:

<form   method="传送方式"   action="服务器文件">

讲解:

1.

标签是成对出现的,以
开始,以
结束。

2.action 浏览者输入的数据被传送到的地方,比如一个PHP页面(save.php)。

3.method  数据传送的方式(get/post)。

<form    <strong>method="post"   action="save.php"</strong>>        <label for="username">用户名:</label>        <input type="text" name="username" />        <label for="pass">密码:</label>        <input type="password" name="pass" /></form>

注意:

1、所有表单控件(文本框、文本域、按钮、单选框、复选框等)都必须放在

标签之间(否则用户输入的信息可提交不到服务器上哦!)。

Form中的get和post方法,在数据传输过程中分别对应了GET和POST方法。
二者主要区别如下:

1、Get将表单中数据的按照variable=value的形式,添加到action所指向的URL后面,并且两者使用“?”连接,而各个变量之间使用“&”连接;Post是将表单中的数据放在form的数据体中,按照变量和值相对应的方式,传递到action所指向URL。
如下形式:
     http://www.imooc.com/test.asp?name=lilian&password=12345678
2、Get是不安全的,因为在传输过程,数据被存放在请求的URL地址中,这样就可能会有一些隐私的信息被第三方看到。
3、Get方式传输的数据量非常小,一般限制在 2KB 左右,但是执行效率却比 Post 方法好;而 Post 方式传递的数据量相对较大,它是等待服务器来读取数据,不过也有字节限制,这是为了避免对服务器用大量数据进行恶意攻击,根据微软方面的说法,微软对用 Request.Form()可接收的最大数据有限制,IIS4中为 80KB 字节,IIS5 中为 100KB 字节。

综上所述,请尽量用 Post 方法。

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