Getting Started book Web front-end development Best practices

Efficient web front-end development book

Pagespeed is a free tool performance analysis from Google.

Timeline the time it takes to interact and render web pages

Profile who can view the Web page CPU and Memory occupancy report

Audits provides a list of optimization recommendations and unused CSS rules for various resources and configurations

Compression of code

The text server turns on gzip compression.

UGLIFYJS is not just a compression tool, colleague with JS parsing and code beauty chemical energy

Image compression tool with online tools mostly tinypng compressed PNG format pictures.

Use Jpegmini to compress jpg format pictures

Local applications recommend the use of Imageoptim

The release phase can also be used to build code and resource compression tasks with Ant.

ID with _ Connect class with-connect.

The CSS file header can also be written with comments and explanatory notes.

File version copyright information Author, etc.

JS Comment

The local variable uses the first character lowercase other words the first letter capitalization way

Object-oriented private interface lowercase public interface uppercase.

Prefix the jquery variable with $

Verify page Barley

HTML validator automatically corrects and beautify your code

Better semantics

Replace <s> <strike> with <del>

<abbr> represents an abbreviated abbreviation for the label content

<noscript> indicates that no JS is used. Alternative, but sometimes it's ineffective.

A good practice is to not use JavaScript when the value of the server has a service period to calculate the return

can set the page in the case of disabling JS to jump Web page Baidu's approach is

<noscript><meta http-equiv = "Refresh" content = "0; Url=/baidu.html?from=noscript "/></noscript>

Properties of Meta

Name Meta information

HTTP-EQUIV Command Request

Content

CharSet character encoding

Name content constituent name/value pairs are used to describe site information

Name includes Application-name author description generator

HTTP-EQUIV Properties and Content property combinations, setting specific HTTP directives

Content-type Default-style (rarely used) refresh (first three confirmed) Content-language Set-cookie

<meta http-equiv= "Refresh" content = "+" > 5 minutes after Refresh

Be sure to set the charset before the <title> tag

You can manually set some pages of compatibility mode is not nonstandard but is commonly used meta

<meta http-equiv= "x-ua-compatible" content= "ie=8"/> Start support from IE8

Activates chrome frame in IE9 and the following browsers to force IE to render pages with chrome frame

<meta http-equiv= "x-ua-compatible" content= "chrome = 1"/>

Is that the device appears normal on the mobile device

<meta name= "Viewport" content= "width = Device-width,initial-scale = 1,maximum-scale = 1" >

Features of the fixed website of IE browser

<meta name= "Misapplication-task" content= "name=" Xinxianshi "action-uri=http://www.renren.com/home;icon-uri= Http://a.xnimg.cn/n/res/icons/newsfeed.ico "/>

Semantic tags

Div and span are not semantically

In CSS, you can use the content= "|" To set the content without having to put everything in the HTML

. spliter:before

: The before selector inserts content in front of the content of the selected element.

Use the Content property to specify what you want to insert.

Using label implementations that are smooth and degraded and semantically

<li class= "Reader-action-library" >libarary</li> also because the text does not show

. reader-main-action li{

text-indent:-99999px;

}

Do not display text when CSS is disabled when CSS is disabled to display smoothly

New tags added to HTML

Improve the semantics of HTML important attributes alt title

The element above is one on the left and the lower right element to be unaffected by the above element.

Need to clear floating clear:both first;

Text-indent to achieve the purpose of shadow-hiding text

Building a login table using table tags Tan ambiguous and bloated code

It is best to use label to display the text label of the login form

The label implementation associated with a for back point to the associated tag ID has great advantages in both the radio box and the multi marquee

<form>

<fieldset disabled>//form grouping and disallow input

<legend> Health Information </legend>//title Information

Height: <input type= "text"/>

Weight: <input type= "text"/>

</fieldset>

</form>

TabIndex setting tab order Toggle

Required = ' true ' that the input cannot be empty

Block elements can contain other elements

Inline elements can only contain inline elements

HTML5 don't have to remember these more semantic memories.

HTML5 <meta charset= "UTF-8" >//indicates the definition of page encoding

<meta http-equiv= "content-type" content = "Text/html;chars=utf-8" in HTML4.01 >

become more concise and convenient

HTML5 Introducing CSS style sheets

<link rel= "stylesheet" href= "/CSSDAFDA" >//Neither set type= "Text/css" again

Introducing JS

<strcipt src= "Afdaf.js" ></script>//type= "Text/javascript"

The new input type of space will be degraded smoothly

The two properties of script defer and async will only function if SRC is set.

Defer represents a parallel download and does not modify the DOM tree last loaded execution

Async means that the asynchronous load will execute immediately after the download is complete. Dependencies cannot be used

If the page has inline scripts that depend on the loaded script, it is not appropriate to use the Defer property.

<base> set the default target for a tag such as _blank

Property value Custom Data-length= "XX" reads this property value. dataset[' length ' Set the same

<i> <b> <u> <small> italic bold underline small font

H5 has a lot of tags discarded strike and big.

There are also some properties of the labels being removed

IE old can be generated by the Createlement method of the label

Framework support H5 Old browser Html5shim

MODERNIZR represents a framework for monitoring new features

Type is the total class and format name

<SOURC src= "Video.mp4" type= "Video/mp4" >

<iframe Insert some things >

Files in CSS a default style file a common file an IE-specific file

Reference this file in the page using the conditional comment method unique to IE browser

<!-[if LT IE 8]>

<link rel=stylesheet ' href= "Ie-style.css"/>

<! [endif]-->

To display a new label in HTML5 in IE89 normal to define a requirement in a display Cssreset

Yui frame seems very powerful.

Style sorting letters in CSS recommended from small to large

Sort by the size of the page influence the image layout in front does not affect the layout in the back

Csscomb CSS Free automatic sequencing program

CSS Weights

Id> class pseudo Class Property selector > Label type Pseudo-object > wildcard character

CSS that is reused as much as possible without the ID selector reduces

In order to improve the priority of the compatibility style can be more elements

<!-[if LT ie 8]>//There is also a method <!-[if GT ie 8]><!-->

<! [endif]-->

Relative units and absolute units px pt cm mm in PC

Relative unit Windows relative unit VW VH vmin Vmax font relative unit em ex ch REM

Try to set the sex to size when the overall module changes, you do not need to change the dimensions of the module's internal submodule.

You can explicitly set the body font size to 16px after the sub-module with 0.8 em and the like

REM is a set of relative values based on the root element.

The CSS matching rules and our habits are reversed from right to left.

Avoid using wildcard characters *

Because the ID selector is unique before adding the tag name to the unconscious superfluous increase the matching time

CSS selectors test represents the cost of testing CSS

Try not to set the size of the picture the cost of the CPU rendered by the system

Thumbnails and normal large pictures do not use the same picture to be divided into two pictures

Sprint Map Recommended Length * width = 2500 Sprite Chart Best control within 200k picture attitude AH will consume more transmission time

Csssprit Generator Generator Online

CSS Sprit Cow sprite map CSS Code generator

Spriteme generate sprite graphs and corresponding CSS code by analyzing Web Sites * * * * * * * * * good

CSS Many properties are inheritable color font line-heighttext-align text-tansform

Chrome can have tools to make unnecessary CSS

Remove unused cssrules in audits

For a specific browser prefix-webkit Chrome Safari

Firefox-moz

Ie-ms Opera-o

Automating the addition of browser prefixes

PERFIXR AUTOPERFIXR

Suggested sites for Html5please

Js

Avoid global variable contamination encapsulated in a variable object above var mycurrentaction = {

length:0,

Init:function () {},

Action:function () {}

}

var Mycurr = (function () {

var length = 0;

function init () {}

function action () {}

The return init:init;//external code access init () method is available by calling Mycurr.init to return the exposed interface

})()

Null and undefined themselves compare to each other as true

Primitive types (numeric, Boolean, character types) are converted to numeric types for comparison

object is compared with the original type when the object is compared to the original type

With (object) {

}

When JS runs, it will create a separate variable for the function to be used as a local variable.

Avoid using with only the runtime to know that the variable belongs to that object

With compatibility issues, ECMA 5 and 6 are implemented differently on the width [] parameter

Eval ("x = 1;y = 2;x*y") is the execution of the contents of the string as code. There are security issues

It is best not to write browser judgment logic directly detect browser feature support

Just add the following in the script

"Use strict";

It is best not to use strict mode in the global

Preferably written in a function.

JS Code checker tool Jshint

JS can be set obj.style.cssText + = "border:1px solid #f00"

The above is not a best practice best practice is to change the class

Generating an inner child element of an element by InnerHTML

<script id = "XXX" type= "Text/x-tmpl" >

</script>

When you need to get the template code through

var infotemplate = document.getElementById (' Main_info '). InnerHTML;

<template> tags in HTML5

Mustache Template System

MVC CMV

JS Modular specification mainly has two kinds of commonjs and AMD

Synchronous and asynchronous load modules a major use in the server and a primary use in the front end

The JS library that implements the AMD module is mainly Requirejs

Ajax can't abuse otherwise replace y an entire UI can be changed page break the back button on the browser jquery has related plugins

JS is a single-threaded blocking state downloaded and loaded

It is recommended to put JS at the bottom of the body

Defer

Tell the browser that this JS code will not produce any page content, so the browser can continue to parse the page's subsequent content as it loads the reference.

Load on Demand

Use less Forin

JS does not exist block scope

When multiple functions are nested defined, a scope contains a relationship called a scope chain

Internal function Multiple external data well shorthand for one

var doc = document;

Prototype prototype object

The properties and methods on the instance come from itself and the corresponding prototype object.

Frequent reads of objects and properties on the prototype chain can affect performance.

DOM and JS are modules that are stored in two unrelated modules, resulting in a loss of performance

and Dom rearrangement and redrawing can also lead to a loss of performance.

Dom additions and deletions and modifications of the DOM elements are visible.

Requesting DOM element layout information can result in a very good performance loss Offersettop ClientX

Frequently modifying DOM styles

Ele.style.border .....

Not advocating merger as a

Optimization change classname Csstext + =

Cloning DOM Memory operations

var old = Document.daadfafdsaf

var clone = Old.clonenode (true);

The animation effect is set to fixed or absolute to avoid page re-arrangement.

Too many event bindings can result in poor performance. It is best to use the bubbling mechanism to bind events on the parent element, which is the event managed

Using the Timeline tool chrome

Online Code Performance analysis tool JsPerf

Common web front-end attack methods

XSS do everything you can to run code on a browser page that is not a browser

CSRF can not participate without JS

Ddos

Hijack above an IFRAME overlay

Cookie set to HttpOnly prohibit JS operation Cookie

Viewport support for the mobile side

Compatible mobile end use streaming layout percent fixed width

Borrowing media queries Technology

@media (max-wdith:600px) {

. facet_sidebar{

Display:none;

}

}

/* Display specific html*/by writing the appropriate media query from large to small above

A different set of pixels than a clear picture

@media only screen Animation-delay: (min-device-pixel-radio:1.5) {

#my-image{

Background:url (high.png);

}

}

/* You can also use the image method */

Background-image:image-set (

/* Indicates a pixel ratio of 1 and 2 */

URL (icon1x.jpg) 1x,

URL (icon2x.jpg) 2x

);

More is the use of technical library Picturefill

BOOTSTAP-Responsive Design related

Howtogomo checking the compatibility effect of websites on mobile devices

Mobile site generally choose the desktop side of the site's two-level domain name m start

Monitor information use-agent for mobile devices

Design a mobile app to avoid page jumps for single-page mode

Mobile Development Framework jquery Mobile

Chrome has the technology to enable the phone to open Debug and start debugging on the computer side

Want the browser to automatically recognize the phone number

<meta name= "format-detection" content= "Telephone=yes" >

<a href= "tel:1-406-666-xxxx" >ddafdaf</a> Telephone

<a href= "sms:1-406-666-xxxx" >ddafdaf</a> SMS

Use table and IFRAME as little as possible on the mobile side

Use UL ol instead

Font Awesome for chart type

Inline picture Base64

Some do not need to long press the way out of the dialog box

User-select:none;

Mouse related events have corresponding gesture-related events

The tab event is a simulation of the Click event because the Click event causes a 300ms delay on the mobile side

There is also a Tabhold event through practice to determine which event ~

Avoid using a timer to accomplish tasks that require accurate control of time during web mobile development.

Getting Started book Web front-end development Best practices