英文: W3C: 1. Document Object Model Events 2. Document Object Model (DOM) Level 3 Events MDN: 1. Event reference 2. Event w3school: http://www.w3schools.com/jsref/dom_obj_event.asp 中文: MDN: 1. Event reference 2. Event w3school: http://www.w3school.com.cn/jsref/dom_obj_event.asp
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