todomvc经典案例?

redux案例todomvc的MainSection的todo这个参数怎么来的

//这里的TODO_FILTERS是objectliteralconstTODO_FILTERS={//SHOW_ALL/SHOW_ACTIVE等是它的computedpropertyname，[SHOW_ALL]:()=>true,[SHOW_ACTIVE]:todo=>!todo.completed,/*todo=>todo.completed是arrowfunction*todo是该function的形参*/[SHOW_COMPLETED]:todo=>todo.completed}

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