在 React 中构建一款可靠的 Pokémon 游戏:开发者的冒险!
s:单一职责 - 一只神奇宝贝,一份工作
问题:pokemoncomponent 处理捕捉、战斗和显示分数,违反了 srp。
function pokemoncomponent({ pokemon, oncatch, onbattle, score }) { return ( <div> <h2>{pokemon.name}</h2> <button onclick={() => oncatch(pokemon)}>catch</button> <button onclick={() => onbattle(pokemon)}>battle</button> <div>score: {score}</div> </div> ); }
解决方案:责任划分。
function pokemoncatcher({ pokemon, oncatch }) { return <button onclick={() => oncatch(pokemon)}>catch</button>; } function pokemonbattler({ pokemon, onbattle }) { return <button onclick={() => onbattle(pokemon)}>battle</button>; } function scoreboard({ score }) { return <div>score: {score}</div>; } function pokemongame({ pokemon, oncatch, onbattle, score }) { return ( <div> <h2>{pokemon.name}</h2> <pokemoncatcher pokemon={pokemon} oncatch={oncatch} /> <pokemonbattler pokemon={pokemon} onbattle={onbattle} /> <scoreboard score={score} /> </div> ); }
o:开放/封闭 - 进化的神奇宝贝组件
问题:添加电源等功能需要修改现有组件。
解决方案:使用高阶组件(hoc)。
function withpowerup(pokemoncomponent) { return function poweredupcomponent(props) { const [ispoweredup, setpowerup] = usestate(false); const powerup = () => { setpowerup(true); settimeout(() => setpowerup(false), 5000); }; return ( <div> <pokemoncomponent {...props} ispoweredup={ispoweredup} /> <button onclick={powerup}>power up!</button> </div> ); }; } const charmander = ({ ispoweredup }) => ( <div>charmander {ispoweredup && "(powered up!)"}</div> ); const poweredcharmander = withpowerup(charmander); function pokemonapp() { return <poweredcharmander />; }
l:里氏替换 - 可互换的神奇宝贝
问题:交换组件会导致问题。
解决方案:使用基础组件。
function basepokemon({ attack, children }) { return ( <div classname="pokemon"> <div>attack: {attack}</div> {children} </div> ); } function pikachu({ attack }) { return ( <basepokemon attack={attack}> <h2>pikachu</h2> </basepokemon> ); } function charizard({ attack }) { return ( <basepokemon attack={attack}> <h2>charizard</h2> </basepokemon> ); } function pokemonbattle() { return ( <div> <basepokemon attack="tackle"> <h2>generic pokémon</h2> </basepokemon> <pikachu attack="thunderbolt" /> <charizard attack="flamethrower" /> </div> ); }
d:依赖倒置 - 依赖于抽象
问题:组件与数据源紧密耦合。
解决方案:使用上下文进行数据注入。
const PokemonContext = createContext(); function Pikachu() { const { attack } = useContext(PokemonContext); } <PokemonContext.Provider value={{ attack: "Thunderbolt" }}> <Pikachu /> </PokemonContext.Provider>
备忘单:坚实的原则
principle | poké-mantra | trainer’s tip |
---|---|---|
single responsibility | one pokémon, one role. | split complex components into focused ones. |
open/closed | evolve without changing. | use hocs, render props for new features. |
liskov substitution | components like pokémon moves - interchangeable. | ensure components can be used interchangeably. |
dependency inversion | depend on abstractions, not concretes. | use context or props for data management. |
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