简要提纲 addEventListener，the 3rd parameter，true: parent to child，false: child to parent onMouseOver/Out，与 child 节点交互时，先 Out 再 […]
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勤奋 – 创新 – 矢志不渝 – 锲而不舍
简要提纲 addEventListener，the 3rd parameter，true: parent to child，false: child to parent onMouseOver/Out，与 child 节点交互时，先 Out 再 […]