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此题可以考察的知识点： @@ -15,6 +15,14 @@ - flex布局（css3） +### 让元素垂直居中 + +**方式一：**如果宽高已知，可以利用绝对定位。 + +**方式二：** + + + ## 变量提升 @@ -185,6 +193,21 @@ Yslow和pageSpeed你知道怎么用吗？你记得其中多少规则？ +## DNS的查询时间 + +**问题：**前端怎样拿到DNS的查询时间？ + +### H5中的方法：performance.timing + +window.performance这个api可以用来做前端性能监控。其中，timing这个方法。。 + + +参考链接： + +- + + + ```javascript diff --git a/12-前端进阶/04-前端监控技术.md b/12-前端/04-前端监控技术.md similarity index 100% rename from 12-前端进阶/04-前端监控技术.md rename to 12-前端/04-前端监控技术.md diff --git a/12-前端进阶/09-lazyload&防抖动和节流阀.md b/12-前端/09-lazyload&防抖动和节流阀.md similarity index 100% rename from 12-前端进阶/09-lazyload&防抖动和节流阀.md rename to 12-前端/09-lazyload&防抖动和节流阀.md diff --git a/13-前端面试/清单.md b/13-前端/清单.md similarity index 100% rename from 13-前端面试/清单.md rename to 13-前端/清单.md diff --git a/13-前端面试/网友面经/20180116-博客园：一年经验初探阿里巴巴前端社招.md b/13-前端/网友面经/20180116-博客园：一年经验初探阿里巴巴前端社招.md similarity index 100% rename from 13-前端面试/网友面经/20180116-博客园：一年经验初探阿里巴巴前端社招.md rename to 13-前端/网友面经/20180116-博客园：一年经验初探阿里巴巴前端社招.md diff --git 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