1、radio在没有name属性时是选择不了的，name属性起了对几个radio分组的作用，而checkbox没有此限制
2、The NAME attribute cannot be set at run time on elements dynamically created with the createElement method. To create an element with a name attribute, include the attribute and value when using the createElement method.
name属性不能在运行过程中进行变更，只能在创建时指定