React源码学习（四）React-ref

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react-ref

通过获取实例，操作其属性及方法。
React暴露api，React.createRef();
该源码位于 ReactCreateRef.js

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import type {RefObject} from 'shared/ReactTypes';

// an immutable object with a single mutable value
export function createRef(): RefObject {
  const refObject = {
    current: null,
  };
  if (__DEV__) {
    Object.seal(refObject);
  }
  return refObject;
}

通过将实例挂载到current上，操作实例。