What input tags exist for different purposes?

The input tag is a very common tag in HTML, used to receive user input data. It can be used in a variety of ways, including text input, password hiding, radio buttons, check boxes, submit buttons, and more.

1. Text input
   Text input is used to receive text information entered by the user, such as user name, email address, etc. Code example:

   <label for="username">用户名：</label>
   <input type="text" id="username" name="username" placeholder="请输入用户名">

   In the above code, the type attribute is set to "text", indicating that the input box is a text input box. The id attribute and name attribute are used to identify the input box, and the placeholder attribute is used to display prompt information in the input box.

2. Password hiding
   Password hiding is used to receive password information input by the user. The input content will be displayed in the form of asterisks or dots. Code example:

   <label for="password">密码：</label>
   <input type="password" id="password" name="password" placeholder="请输入密码">

   In the above code, the type attribute is set to "password", indicating that the input box is a password input box. The usage of other attributes is the same as for text input.

3. Radio button
   The radio button is used to select one option from multiple options. Code example:

   <label for="gender">性别：</label>
   <input type="radio" id="male" name="gender" value="male">
   <label for="male">男性</label>
   <input type="radio" id="female" name="gender" value="female">
   <label for="female">女性</label>

   In the above code, the type attribute is set to "radio", indicating that this is a radio button. The name attribute is used to group multiple radio button boxes, and the value attribute is used to specify the value of the option.

4. Checkbox
   Checkbox is used to select multiple options from multiple options. Code example:

   <label for="hobby">爱好：</label>
   <input type="checkbox" id="reading" name="hobby" value="reading">
   <label for="reading">阅读</label>
   <input type="checkbox" id="music" name="hobby" value="music">
   <label for="music">音乐</label>

   In the above code, the type attribute is set to "checkbox", indicating that this is a checkbox. The usage of other attributes is the same as that of radio button.

5. Submit button
   The submit button is used to submit form data to the handler on the server. Code example:

   <input type="submit" value="提交">

   In the above code, the type attribute is set to "submit", indicating that this is a submit button. The value attribute is used to specify the text displayed on the button.

In addition to the above common usages, the input tag has other attributes and usages, including file upload, date selection, color selection, etc. By using input tags appropriately, we can easily build a rich user interface.

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