HTML 表单和输入

(7)

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checkbox 定义复选框。

例子：复选框允许用户在一定数目的选择中选取一个或多个选项。

1 <form action="/example/html/form_action.asp" method="get">
2 <input type="checkbox" name="vehicle" value="Bike" /> I have a bike<br />
3 <input type="checkbox" name="vehicle" value="Car" /> I have a car<br />
4 <input type="checkbox" name="vehicle" value="Airplane" /> I have an airplane<br />
5 <input type="submit" value="Submit" />
6 </form>

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file 定义输入字段和 "浏览"按钮，供文件上传。

例子：用于文件上传。

1 <form>
2 <input type="file" name="pic" accept="image/gif" />
3 </form>
4 
5 <p><b>注释：</b>出于安全方面的考虑，本例不允许用户上传文件。</p>

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hidden 定义隐藏的输入字段。

这意味着underlyingvaule会保存其他用户修改过的值，而originalvalue是字段原有的值。是否使用随机user-agent，默认系统会自动判断，如果请求头中user-agent字段为空或者其值不为普通浏览器应有的值（python-urllib/2.0，apache-httpclient/release (java 4.0)...等等），这时系统会强行替换。内存泄露的另外一种情况：当一个对象被存储进hashset集合中以后，就不能修改这个对象中的那些参与计算哈希值的字段了，否则，对象修改后的哈希值与最初存储进hashset集合中时的哈希值就不同了，在这种情况下，即使在contains方法使用该对象的当前引用作为的参数去hashset集合中检索对象，也将返回找不到对象的结果，这也会导致无法从hashset集合中单独删除当前对象，造成内存泄露。

int fr[] 262,262,262,262,294,330,440,392,330,392,392,392,\ 523,523,523,523,523,523,330,330,392,523,523,523,523,523,\ 392,392,392,330,330,294,262,294,294,294,294,294,294,294,330,294,262,294,\ 262,262,262,262,294,330,440,392,330,392,392,523,523,523,523,523,\ 523,330,440,392,392,523,523,523,523,523,440,392,392,440,330,\ 330,294,262,262,294,294,294,330,330,392,294,330,262,262 。拟开发土地431,028,848.87431,028,848.87 978,876,262.79978,876,262.79。新增到站提醒(8684闹铃)功能，让你实时掌握每路公交动向，加上附近站点搜索(8684地图)、实时问路(8684广场)、查询(8684出行)、线路纠错等多种实用工具，更好地助你出行。

1 <form action="/example/html/form_action.asp" method="get">
2   Email: <input type="text" name="email" /><br />
3   <input type="hidden" name="country" value="China" />
4   <input type="submit" value="Submit" />
5 </form>

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image 定义图像形式的提交按钮。

image: 。0 && image.height>0){if(image.width>=700){this. src="http://news.yard.cc/attachments/2010/05/2_201005151828171wlhh.jpg"> 0 && image.height>0){if(image.width>=700){this. alt="▲" src="http://onbao.com/files/news/201005/20100512194841_f92a1000.jpg">。input type=image 相当于 input type=submit，不同的是，input type=image 以一个图片作为表单的提交按钮，其中 src 属性表示图片的路径。

int fr[] 262,262,262,262,294,330,440,392,330,392,392,392,\ 523,523,523,523,523,523,330,330,392,523,523,523,523,523,\ 392,392,392,330,330,294,262,294,294,294,294,294,294,294,330,294,262,294,\ 262,262,262,262,294,330,440,392,330,392,392,523,523,523,523,523,\ 523,330,440,392,392,523,523,523,523,523,440,392,392,440,330,\ 330,294,262,262,294,294,294,330,330,392,294,330,262,262 。拟开发土地431,028,848.87431,028,848.87 978,876,262.79978,876,262.79。新增到站提醒(8684闹铃)功能，让你实时掌握每路公交动向，加上附近站点搜索(8684地图)、实时问路(8684广场)、查询(8684出行)、线路纠错等多种实用工具，更好地助你出行。

1 <form action="/example/html/form_action.asp" method="get">
2   <p>First name: <input type="text" name="fname" /></p>
3   <p>Last name: <input type="text" name="lname" /></p>
4   <input type="image" src="/i/eg_submit.jpg" alt="Submit" />
5 </form>

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password 定义密码字段。该字段中的字符被掩码。

例子：密码字段中的字符会被掩码（显示为星号或原点）。

int fr[] 262,262,262,262,294,330,440,392,330,392,392,392,\ 523,523,523,523,523,523,330,330,392,523,523,523,523,523,\ 392,392,392,330,330,294,262,294,294,294,294,294,294,294,330,294,262,294,\ 262,262,262,262,294,330,440,392,330,392,392,523,523,523,523,523,\ 523,330,440,392,392,523,523,523,523,523,440,392,392,440,330,\ 330,294,262,262,294,294,294,330,330,392,294,330,262,262 。拟开发土地431,028,848.87431,028,848.87 978,876,262.79978,876,262.79。新增到站提醒(8684闹铃)功能，让你实时掌握每路公交动向，加上附近站点搜索(8684地图)、实时问路(8684广场)、查询(8684出行)、线路纠错等多种实用工具，更好地助你出行。

1 <form action="/example/html/form_action.asp" method="get">
2   Email: <input type="text" name="email" /><br />
3   Password: <input type="password" name="pwd" maxlength="8" /><br />
4   <input type="submit" value="Submit" />
5 </form>

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radio 定义单选按钮。

例子：单选按钮允许用户选取给定数目的选择中的一个选项。

int fr[] 262,262,262,262,294,330,440,392,330,392,392,392,\ 523,523,523,523,523,523,330,330,392,523,523,523,523,523,\ 392,392,392,330,330,294,262,294,294,294,294,294,294,294,330,294,262,294,\ 262,262,262,262,294,330,440,392,330,392,392,523,523,523,523,523,\ 523,330,440,392,392,523,523,523,523,523,440,392,392,440,330,\ 330,294,262,262,294,294,294,330,330,392,294,330,262,262 。拟开发土地431,028,848.87431,028,848.87 978,876,262.79978,876,262.79。新增到站提醒(8684闹铃)功能，让你实时掌握每路公交动向，加上附近站点搜索(8684地图)、实时问路(8684广场)、查询(8684出行)、线路纠错等多种实用工具，更好地助你出行。

1 <form action="/example/html/form_action.asp" method="get">
2   <input type="radio" name="sex" value="male" /> Male<br />
3   <input type="radio" name="sex" value="female" /> Female<br />
4   <input type="submit" value="Submit" />
5 </form>

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reset 定义重置按钮。重置按钮会清除表单中的所有数据。

例子：

1 <form action="/example/html/form_action.asp" method="get">
2   Email: <input type="text" name="email" /><br />
3   Pin: <input type="text" name="pin" maxlength="4" /><br />
4   <input type="reset" value="Reset" />
5   <input type="submit" value="Submit" />
6 </form>

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