fix<Todo>: 修复Todo组件使用回车键创建任务时创建多个#144
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现象
TODO页面使用回车键创建任务时会创建多个(实际上为该任务的字符串长度个)
原因 & 解决
AddLine组件中的input的onChange引起重新渲染, onAdd监听的value发生变化, 导致useEffect中的inputRef不停添加监听函数, addEventListenter会不停在该ref上注册事件, value变化多少次, 就添加了多少个监听事件, 见DOM0和DOM2事件绑定的区别