在Node(v8.4)中运行以下代码classTodoStore{todos=[];getcompletedTodosCount(){returnthis.todos.filter(todo=>todo.completed===true).length;}report(){if(this.todos.length===0)return"";return`Nexttodo:"${this.todos[0].task}".`+`Progress:${this.completedTodosCount}/${this.todos.length}`;}addTodo(task){this.tod

在Node(v8.4)中运行以下代码classTodoStore{todos=[];getcompletedTodosCount(){returnthis.todos.filter(todo=>todo.completed===true).length;}report(){if(this.todos.length===0)return"";return`Nexttodo:"${this.todos[0].task}".`+`Progress:${this.completedTodosCount}/${this.todos.length}`;}addTodo(task){this.tod