我有一个MobX可观察数组,我想用lodash的remove删除多个元素。这会导致重新渲染数组中的每个元素。
const array = observable([1,2,3,4,5,1]);
const App = observer(() => {
console.log('Rendering...');
return (
<div>
{ array.map(e => <div> {e} </div>)}
</div>
);
});
ReactDOM.render(
<App />,
document.getElementById('app')
);
如果我尝试删除1
的每一次出现,则会为每个元素记录一次Rendering...
:
_.remove(array, num => num === 1);
> "Rendering..."
> "Rendering..."
> "Rendering..."
> "Rendering..."
> "Rendering..."
> "Rendering..."
我怎样才能让它重新渲染一次?
答案 0 :(得分:5)
MobX的API看起来就像vanilla JavaScript,但是可观察数组的每次更改都会导致所有观察者的同步更新。要缓解这种情况,只需将更改包装在transaction:
中transaction(() => _.remove(array, num => num === 1));
> "Rendering..."