中文摘要：

当消费者对非计划购买产生犹豫时,营销者应如何引导他们的购买行为？本文通过准实验与控制实验的方法探究该问题。研究结果显示：（1）营销者可以通过设计预期欣喜和预期后悔信息提高其非计划购买意向;（2）但是预期性思考的有效性还受到消费者自我调节导向的影响：预期欣喜对提高趋利导向消费者的非计划购买意向较有效,预期后悔对提高避害导向消费者的非计划购买意向较有效;（3）预期欣喜和预期后悔通过影响消费者对购买合理性的判断而影响他们的非计划购买意向。

英文摘要：

Unplanned purchase is very pervasive in daily life, which is characterized by the combination of cognition and affect. This study aimed at investigating the question of how to influence consumers＇unplanned purchase decision when they hesitate on whether to buy or not. Previous studies confirmed that prefactual thinking can affect consumers＇ behaviors through signifying possible results of a certain behavior. Thus, we proposed that both anticipated regret and anticipated rejoice has the potential to enhance consumers＇ unplanned purchase intention. The motivation theory, however, suggests that consumers with different regulatory focuses have different sensitiveness towards gains and losses. Based on that, we proposed that anticipated regret was more effective for prevention-focused consumers, while anticipated rejoice was more effective for promotion-focused consumers. Regarding the mechanism of the effect of prefactual thinking, we drew inspiration from justification theory and proposed that prefactual thinking influences consumers＇judgment of reasonableness of unplanned purchase, through which to influence their unplanned purchase intention. This research contained two studies. Study 1 utilized quasi-experiment method with 136 subjects to examine the interactive effects of prefactuat thinking and regulatory focus on unplanned purchase intention. In this study, we measured participants＇regulatory focuses and manipulated their prefactual thinking. We used paired t-test to examine the impact of anticipated regret and anticipated rejoice on the change of unplanned purchase intention, and used two-way ANOVA to analyze the interactive effects of prefactual thinking and regulatory focus on subjects＇ final unplanned purchase intention and on their intention change. Study 2 was designed as an experiment with 218 subjects to examine the role of justification in the process. In this study, we manipulated both subjects＇ regulatory focuses and their prefactual thinking. Like in Study 1, we utilized paired t-test