目录1,监听器模式的基本原理监听器模式的步骤2,实际应用场景 2.1 图形用户界面（GUI）事件处理2.2 数据模型更新通知2.3 日志系统2.4 文件系统监控2.5 网络和分布式系统2.
I\'ve wrote some jquery code with some draggable elements and one droparea. Unfortunately my droparea can\'t make a difference between various object.
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