[Javascript]2. Improve you speed! Script Execution
Let's take a closer look at how a browser retrieves and acts on scripts.
modern browser can parallel downloading 6 files(style sheets && images)
at a time. BUT, when it see Scripts, the parallel downloading will stop!
Therefore, any scripts in <head></head> which are not that necessary to be there
might affect you browser performance
1. Scripts that are not essential to immediate loading of the page should be
moved as low as possible, in front of </body>
2. With external files, the HTML5 async attribute will allow the rest of the
page to load before the script runs.
When browser loading page, once see async attribute,
it will now fetch the script resource, but will continue parsing and rendering
HTML, without waiting for the script to complete!
<script src="formOjbect.js" async></script>
-----------------------------Ex------------------------------
"Be careful, for data intensive processes are the ones that will stop the show. Which of these included script tags will take the longest to load"
inhabitants.js
var invertedPeninsula = {
inhabitants: [
"Nipping Global Variable",
"Sneaky For-in",
"Bulging Blocking Script"
]
}
function populationGetter(){
var population = invertedPeninsula.inhabitants;
var list = "";
for(var i = 0, ff = population.length; i < ff; i++){
list += (population[i] + " ");
}
return list.trim();
}
populationGetter();
info.js
var land = "Inverted Peninsula";
var character = "Dhuun";
var lampsLit = 1;
inhabitantsProto.js
Array.prototype.killTheInsolent = function(){};
Array.prototype.countPopulace = function(){};
Array.prototype.countUndeadPopulace = function(){};
Array.prototype.incesticide = function(){};
Array.prototype.shadowProvider = function(){};
[Javascript]2. Improve you speed! Script Execution的更多相关文章
- [Javascript]3. Improve you speed! Performance Tips
/** Let inheritance help with memory efficiency */ function SignalFire(ID, startingLogs){ this.fireI ...
- [Javascript]1. Improve you speed! Loop optimaztion
/** Improve you loop code */ var treasureChest = { goldCoins: 10000, magicalItem : "Crown of Sp ...
- 【JavaScript性能优化】------理解Script标签的加载和执行
1.script标签是如何加载的?当浏览器遇到一个 < script>标签时,浏览器会停下来,运行JavaScript代码,然后再继续解析.翻译页面.同样的事情发生在使用 src 属性加载 ...
- javaScript中的小细节-script标签中的预解析
首先介绍预解析,虽然预解析字面意思很好理解,但是却是出坑出的最多的地方,也是bug经常会有的地方,利用好预解析的特性可以解决很多问题,并且提高代码的质量及数量,浏览器在解析代码前会把变量的声明和函数( ...
- 完整的JavaScript包括三部分、script标签、JavaScript的基本语法以及变量和字面量的关系
完整的JavaScript包括三大部分: -ECMAScript JavaScript的开发规范:提供核心语言功能 -DOM document object model 文档对象模型:提供 ...
- Increase PHP script execution time with Nginx
If you have a large WordPress setup or a server with limited resources, then you will often see the ...
- unity 脚本执行顺序设置 Script Execution Order Settings
通过Edit->Project Settings->Script Execution Order打开MonoManager面板 或者选择任意脚本在Inspector视图中点击Execu ...
- Unity3D Script Execution Order ——Question
我 知道 Monobehaviour 上的 那些 event functions 是 在主线程 中 按 顺序调用的.这点从Manual/ExecutionOrder.html 上的 一张图就可以看出来 ...
- JavaScript之<script>标签简介
向html页面中插入JavaScrpt的主要方法,就是使用<script>元素,下面是Html 4.01为<script>定义的6个属性. 1.async:可选表示应该立即下载 ...
随机推荐
- 【递推】Codeforces Round #483 (Div. 2) [Thanks, Botan Investments and Victor Shaburov!] D. XOR-pyramid
题意:定义,对于a数组的一个子区间[l,r],f[l,r]定义为对该子区间执行f操作的值.显然,有f[l,r]=f[l,r-1] xor f[l+1,r].又定义ans[l,r]为满足l<=i& ...
- 【洛谷】3469：[POI2008]BLO-Blockade【割点统计size】
P3469 [POI2008]BLO-Blockade 题意翻译 在Byteotia有n个城镇. 一些城镇之间由无向边连接. 在城镇外没有十字路口,尽管可能有桥,隧道或者高架公路(反正不考虑这些).每 ...
- python日常碎碎念--PIL
昨天在处理网站相关图片的时候,发现图片都大小不一样,虽然一下就能想起PIL这个库,但是用法却不记得了. 简单记录一下用法. 可以直接用 Image.open 来打开图片,PIL库为这个文件对象提供了各 ...
- 射洪中学讲课PPT
咸鱼跑去射洪中学讲课去啦. 高中生好萌呀!!!! 下面是讲课PPT day3 简单吹了一波noip2015如何骗分,所以课件就是去网上到处kuai题解而已,所以课件我就不上传了. day4 题目+题解 ...
- UVALive 4863 Balloons 贪心/费用流
There will be several test cases in the input. Each test case will begin with a line with three inte ...
- spring---aop（9）---Spring AOP中引入增强
写在前面 Spring将introduction通知看作一种特殊类型的拦截通知.用Spring的行话来讲,对方法的增强叫做Wearing(织入),而对类的增强叫introduction(引入).Int ...
- Android 手机 无线 ADB
要用网络调试Android需要设备已经获取root权限 如果手机没有命令行工具,请先在手机端安装终端模拟器,然后在终端输入: $su #stop adbd #setprop service.adb.t ...
- JEECG第二期深入使用培训（报名截止2014-06-21）
JEECG第二期深入使用培训(报名截止2014-06-21) JEECG深度研究-交流碰撞火花,你学会的不不过JEECG,很多其它的是软件架构思想 http://www.jeecg.org/forum ...
- AES加密时抛出java.security.InvalidKeyException: Illegal key size or default parametersIllegal key size or default parameters
使用AES加密时,当密钥大于128时,代码会抛出java.security.InvalidKeyException: Illegal key size or default parameters Il ...
- jQuery闭包之浅见,从面向对象角度来理解
本篇的标题虽然是"jQuery闭包之浅见...",但实际上本篇涉及的多半是javascript"闭包"相关内容,之所以写这个标题,完全是因为自己平常用jQuer ...