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refactor: 追加effectStack的注释

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Original file line number	Diff line number	Diff line change
`@@ -50,6 +50,7 @@ const effectStack: ReactiveEffect[] = []`
`50`	`50`	`export function effect(fn: () => any, options: ReactiveEffectOptions = {}) {`
`51`	`51`	`const effect = createReactiveEffect(fn, options)`
`52`	`52`	`if (!options.lazy) {`
	`53`	`+ // 如果没有 lazy 选择就立即运行 effect()一次`
`53`	`54`	`effect()`
`54`	`55`	`}`
`55`	`56`	`return effect`
`@@ -93,7 +94,7 @@ function run(effect: ReactiveEffect, fn: Function, args: unknown[]): unknown {`
`93`	`94`	`* @param key 被依赖收集的对象key`
`94`	`95`	`*/`
`95`	`96`	`export function track(target: object, key: string \| symbol) {`
`96`		`- // 获取最新入栈的 effect`
	`97`	`+ // 获取最新入栈的 effect(如果没有设置effect, effectStack即为空)`
`97`	`98`	`const effect = effectStack[effectStack.length - 1]`
`98`	`99`	`if (effect) {`
`99`	`100`	`let depsMap = targetMap.get(target)`

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