Function registerLoading

src/core/echarts.ts:3289–3294

(
    name: string,
    loadingFx: LoadingEffectCreator
)

}

export function registerLoading(
    name: string,
    loadingFx: LoadingEffectCreator
): void {
    loadingEffects[name] = loadingFx;
}

/**
 * ZRender need a canvas context to do measureText.