取消前有效訂單是購買或出售股票的訂單，該訂單持續到訂單完成或取消。
長訂單週期維持90個自然日，逾期自動取消訂單。
*如果發生任何公司行動（拆股、合股等），所有未執行的取消前有效訂單一般都會被自動取消。
此服務只提供以下的美股市場
使用“取消前有效” 流程
1. 點擊 “有效期”右邊的按鈕
2.選擇 "取消前有效"
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