<!-- 多选框input type="checkbox"checked: 默认选中--><p>爱好:<input type="checkbox" value="sleep" name="hobby">睡觉<input type="checkbox" value="code" name="hobby" checked>敲代码<input type="checkbox" value="chat" name="hobby">聊天<input type="checkbox" value="game" name="hobby">游戏</p><!--  按钮input type="button"  普通按钮input type="image"   图像按钮input type="submit"  提交按钮input type="reset"   重置--><p>按钮:<input type="button" name="btn1" value="我是按钮"><input type="image" src="resources/image/1.jpg"></p><p><input type="submit"><input type="reset" value="清空表单"></p>

https://www.bilibili.com/video/BV1x4411V75C?p=14&spm_id_from=pageDriver