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2019第四周 #14

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huruji opened this issue Jun 14, 2019 · 3 comments

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huruji commented Jun 14, 2019

https://chrome.google.com/webstore/detail/performance-analyser/djgfmlohefpomchfabngccpbaflcahjf/related

利用 performance API 可视化展示网页性能数据的插件

Owner Author

huruji commented Jun 16, 2019

js的类型转换：

1. undefined == null，结果是true。且它俩与所有其他值比较的结果都是false。
1. String == Boolean，需要两个操作数同时转为Number。
1. String/Boolean == Number，需要String/Boolean转为Number。
1. Object == Primitive，需要Object转为Primitive(具体通过valueOf和toString方法)。

Owner Author

huruji commented Jun 17, 2019

css加载会造成阻塞吗？

webkit 渲染过程

Gecko渲染过程

Owner Author

huruji commented Jun 24, 2019

形象地解释了 css 选择器优先级地问题

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