js6（中级训练：bom和dom）
事关es6的提升问题，还有后期vue的学习
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dom api：
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bom api:
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开讲dom
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js文档加载：
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dom文件加载：
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js dom查询
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js利用dom实现全选：
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js dom增删改
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a的索引：
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js操作内联样式
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js事件
事件对象
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js的事件是bom吗
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事件冒泡，委派，绑定，传播
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js事件有哪些
拖拽
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滚轮事件：
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键盘事件：
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bom
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js 事件，bom，dom
如何利用事件去操作dom或bom
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开讲bom：
定时器属于bom：
