一些基本的表单指令
1. 创建表单
<form>---</form>
2. 文字解释
<label for = ---> ---文字解释--- </label>
3. 文本框
<input type = "text" name = "------">
4. 密码框
<input type = "password" name = "------">
5. 单选按钮
<input type = "radio" name = "------" value = num >"选项名"
6. 复选按钮
<input type = "checkbox" name = "------" value = num >"选项名"
7. 下拉列表
<select name = "---" <option value = "num">------</option> <option value = "num + 1">------</option> <option value = "num + 2">------</option> </select>
8. 文字区域
<textarea name = "------" rows(行数) = "num" clos(列数) = "num" ></textarea>
9. 按钮
<input type = "submit" value = "提交"> <input type = "reset" value = "重置"> <inpur type = "button" value = "返回">
10. 隐藏字段
<input type = "hidden" name = "------" value = "num">
11. 输入数字
<input type = "number" max = number min = number step = number value = number> - max number 规定允许的最大值 - min number 规定允许的最小值 - step number 规定合法的数字间隔(如果step = "3" ,则合法的数是 -3 0 3 6等) - value number 规定默认值
12. 滑块
<input type = "range" max = number min = number step = number value = number> - max number 规定允许的最大值 - min number 规定允许的最小值 - step number 规定合法的数字间隔(如果step = "3" ,则合法的数是 -3 0 3 6等) - value number 规定默认值

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