高性能JavaScript简要的相关内容

文章 2016-05-20 来自：开发者社区

高性能JavaScript--数据存储(简要学习笔记二)

1.JavaScript中四种基本数据存取位置：字面量，本地变量，数组元素，对象成员。一般来说：[字面量,局部变量]运行速度>[数组,对象成员] 2.内部属性包含了一个函数被创建的作用域中对象的集合。这个集合被称为作用域链。 3.执行函数->创建执行环境->创建活动对象(即函数运行时变量对象)。所以多次调用同一个函数会导致创建多个执行环境。 &nb...

文章 2016-05-20 来自：开发者社区

高性能JavaScript--快速响应的用户界面(简要学习笔记三)

1.浏览器线程：用于执行JavaScript和更新用户界面的进程被称为“浏览器UI线程”。 2. <1>定时器的出现让出UI线程控制权 setTimeout()，setInterval() <2>分割任务 <3>Web Workers 3.arguments.callee 4.记录代码运行时间...

文章 2016-05-20 来自：开发者社区

高性能JavaScript--加载和执行(简要学习笔记一)

1.多数浏览器使用单一进程来处理用户界面刷新和JavaScript脚本的执行。所以同一时刻只能做同一件事。JavaScript执行过程耗时越久，浏览器等待相应的时间就越长。 2.<script>标签用来加载出现在<head>中的外链JavaScript文件，紧挨着<link>标签用来加载外部css文件或者其他页面元素。理论上来说，把与样式和行为有关...

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