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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 a/13-前端面试/网友面经/面经链接推荐.md b/13-前端/网友面经/面经链接推荐.md similarity index 100% rename from 13-前端面试/网友面经/面经链接推荐.md rename to 13-前端/网友面经/面经链接推荐.md diff --git a/13-前端面试/链接推荐.md b/13-前端/链接推荐.md similarity index 100% rename from 13-前端面试/链接推荐.md rename to 13-前端/链接推荐.md diff --git a/23-Vue框架-组件化思维/01-项目介绍.md b/22-Vue框架-组件化思维/01-项目介绍.md similarity index 100% rename from 23-Vue框架-组件化思维/01-项目介绍.md rename to 22-Vue框架-组件化思维/01-项目介绍.md diff --git a/23-Vue框架-组件化思维/02-项目设计与原理分析.md b/22-Vue框架-组件化思维/02-项目设计与原理分析.md similarity index 100% rename from 23-Vue框架-组件化思维/02-项目设计与原理分析.md rename to 22-Vue框架-组件化思维/02-项目设计与原理分析.md diff --git a/23-Vue框架-组件化思维/03-京东金融的首页.md b/22-Vue框架-组件化思维/03-京东金融的首页.md similarity index 100% rename from 23-Vue框架-组件化思维/03-京东金融的首页.md rename to 22-Vue框架-组件化思维/03-京东金融的首页.md diff --git a/23-Vue框架-组件化思维/08-上线指导.md b/22-Vue框架-组件化思维/08-上线指导.md similarity index 100% rename from 23-Vue框架-组件化思维/08-上线指导.md rename to 22-Vue框架-组件化思维/08-上线指导.md diff --git a/23-Vue框架-组件化思维/09-构建工具.md b/22-Vue框架-组件化思维/09-构建工具.md similarity index 100% rename from 23-Vue框架-组件化思维/09-构建工具.md rename to 22-Vue框架-组件化思维/09-构建工具.md diff --git a/23-Vue框架-组件化思维/11-面试技巧.md b/22-Vue框架-组件化思维/11-面试技巧.md similarity index 100% rename from 23-Vue框架-组件化思维/11-面试技巧.md rename to 22-Vue框架-组件化思维/11-面试技巧.md diff --git a/23-Vue框架-组件化思维/Vue-router.md b/22-Vue框架-组件化思维/Vue-router.md similarity index 100% rename from 23-Vue框架-组件化思维/Vue-router.md rename to 22-Vue框架-组件化思维/Vue-router.md diff --git a/23-Vue框架-组件化思维/Vue基础知识.md b/22-Vue框架-组件化思维/Vue基础知识.md similarity index 100% rename from 23-Vue框架-组件化思维/Vue基础知识.md rename to 22-Vue框架-组件化思维/Vue基础知识.md diff --git a/23-Vue框架-组件化思维/z商城系统.md b/22-Vue框架-组件化思维/z商城系统.md similarity index 100% rename from 23-Vue框架-组件化思维/z商城系统.md rename to 22-Vue框架-组件化思维/z商城系统.md