再普及一次HTML5基础,HTML5必须知道的那些事,HTML5扫盲。下一代Web开发的新特征...

新的选择器

通过 class 定位元素 (DOM API)

var el = document.getElementById('section1');
el.focus();

var els = document.getElementsByTagName('div');
els[0].focus();

var els = document.getElementsByClassName('section');
els[0].focus();

通过类似 css 选择器的语法定位元素 (Selectors API)

var els = document.querySelectorAll("ul li:nth-child(odd)");
var els = document.querySelectorAll("table.test > tr > td");

本地储存 - Web Storage

// use localStorage for persistent storage
//
use sessionStorage for per tab storage
textarea.addEventListener('keyup', function () {
window.localStorage['value'] = area.value;
window.localStorage['timestamp'] = (new Date()).getTime();
}, false);
textarea.value = window.localStorage['value'];

本地数据库 - Web SQL Database

var db = window.openDatabase("Database Name", "Database Version");
db.transaction(function(tx) {
tx.executeSql("SELECT * FROM test", [], successCallback, errorCallback);
});
Chrome中查看生成的数据库: 开发人员 > 开发人员工具 > Storage

文件缓存 - Application Cache API


window.applicationCache.addEventListener('checking', updateCacheStatus, false);
CACHE MANIFEST

# version 1

CACHE:
/html5/src/refresh.png
/html5/src/logic.js
/html5/src/style.css
/html5/src/background.png

让程序在后台运行 - Web Workers

main.js:
var worker = new Worker(‘extra_work.js');
worker.onmessage = function (event) { alert(event.data); };

extra_work.js:
// do some work; when done post message.
postMessage(some_data);

双向信息传输 - Web Sockets

var socket = new WebSocket(location);
socket.onopen = function(event) {
socket.postMessage(“Hello, WebSocket”);
}
socket.onmessage = function(event) { alert(event.data); }
socket.onclose = function(event) { alert(“closed”); }

桌面提醒 - Notifications

if (window.webkitNotifications.checkPermission() == 0) {
// you can pass any url as a parameter
window.webkitNotifications.createNotification(tweet.picture, tweet.title,
tweet.text).show();
} else {
window.webkitNotifications.requestPermission();
}

拖放操作 - Drag and drop

document.addEventListener('dragstart', function(event) {
event.dataTransfer.setData('text', 'Customized text');
event.dataTransfer.effectAllowed = 'copy';
}, false);

地理位置 - Geolocation

if (navigator.geolocation) {
navigator.geolocation.getCurrentPosition(function(position) {
var lat = position.coords.latitude;
var lng = position.coords.longitude;
map.setCenter(new GLatLng(lat, lng), 13);
map.addOverlay(new GMarker(new GLatLng(lat, lng)));
});
}

HTML新的语义标签

<body>


<h1>Page titleh1>
<h2>Page subtitleh2>
hgroup>
header>

新的链接关系

<link rel='alternate' type="application/rss+xml" href="http://myblog.com/feed" />
<link rel='icon' href="/favicon.ico" />
<link rel='pingback' href="http://myblog.com/xmlrpc.php">
<link rel='prefetch' href="http://myblog.com/main.php">
...

<a rel='archives' href="http://myblog.com/archives">old postsa>
<a rel='external' href="http://notmysite.com">tutoriala>
<a rel='license' href="http://www.apache.org/licenses/LICENSE-2.0">licensea>
<a rel='nofollow' href="http://notmysite.com/sample">wannabea>
<a rel='tag' href="http://myblog.com/category/games">games postsa>
...

微数据 - Microdata

<div itemscope itemtype="http://example.org/band">
<p>My name is <span itemprop='name'>Neilspan>.p>
<p>My band is called <span itemprop='band'>Four Parts Waterspan>.p>
<p>I am <span itemprop='nationality'>Britishspan>.p>
div>

无障碍富互联网应用程序属性 - ARIA attributes

<ul id="tree1"
role
="tree"
tabindex
="0"
aria-labelledby
="label_1"
>
<li role="treeitem" tabindex="-1" aria-expanded="true">Fruitsli>
<li role="group">
<ul>
<li role="treeitem" tabindex="-1">Orangesli>
<li role="treeitem" tabindex="-1">Pineapplesli>
...
ul>
li>
ul>

新的表单元素类型

增强已有元素

UI方面:

<input type='range' min='0' max='50' value='0' />
<input results='10' type='search' />
<input type='text' placeholder='Search inside' />

输入检查:(不符合条件的将显示红色背景)

<style> :invalid { background-color: red; } style>
<input type='color' />
<input type='number' />
<input type='email' />
<input type='tel' />
etc...

新增的元素

<meter>
<progress>
<output>
etc...

音频 + 视频 - Audio + Video

<audio src="sound.mp3" controls>audio>
document.getElementById("audio").muted=false;

<video src='movie.mp4' autoplay controls >video>
document.getElementById("video").play();

图形绘制 - Canvas

<canvas id="canvas" width="838" height="220">canvas>

<script>
var canvasContext = document.getElementById("canvas").getContext("2d");
canvasContext.fillRect(
250, 25, 150, 100);

canvasContext.beginPath();
canvasContext.arc(
450, 110, 100, Math.PI * 1/2, Math.PI * 3/2);
canvasContext.lineWidth
= 15;
canvasContext.lineCap
= 'round';
canvasContext.strokeStyle
= 'rgba(255, 127, 0, 0.5)';
canvasContext.stroke();
script>

Canvas 3D (WebGL)

<canvas id="canvas" width="838" height="220">canvas>

<script>
var gl = document.getElementById("canvas").getContext("experimental-webgl");
gl.viewport(
0, 0, canvas.width, canvas.height);
...
script>

HTML5中的SVG

<html>
<svg>
<circle id="myCircle" class="important" cx="50%" cy="50%" r="100"
fill
="url(#myGradient)"
onmousedown
="alert('hello');"/>
svg>
html>

CSS 选择器

奇/偶选择

.row:nth-child(even) {
background
: #dde;
}
.row:nth-child(odd)
{
background
: white;
}

Image-like display

div {
display
: inline-block;
}

通过属性选择

input[type="text"] {
background
: #eee;
}

反选

:not(.box) {
color
: #00c;
}
:not(span)
{
display
: block;
}

以及一些其它的选择方法

h2:first-child { ... }

div.text > div
{ ... }
h2 + header
{ ... }

显示本地没有的字体

@font-face { 
font-family
: 'Junction';
src
: url(Junction02.otf);
}
@font-face
{
font-family
: 'LeagueGothic';
src
: url(LeagueGothic.otf);
}
@font-face
{
font-family
: 'GG250';
src
: url(General250.otf);
}

header
{
font-family
: 'LeagueGothic';
}

文本溢出处理

div {
text-overflow
: ellipsis;
}

分栏显示

-webkit-column-count: 2;  
-webkit-column-rule: 1px solid #bbb;
-webkit-column-gap: 2em;

文本描边

div {
-webkit-text-fill-color
: black;
-webkit-text-stroke-color
: red;
-webkit-text-stroke-width
: 0.00px;
}

透明效果

color: rgba(255, 0, 0, 0.75);  
background: rgba(0, 0, 255, 0.75);

HSL(色相/饱和度/亮度)色彩模式

color: hsla(
128,
75%,
33%,
1.00);

圆角效果

border-radius: 0px;

渐变效果

background: -webkit-gradient(linear, left top, left bottom, from(#00abeb), to(white), color-stop(0.5, white), color-stop(0.5, #66cc00)) 
background: -webkit-gradient(radial, 430 50, 0, 430 50, 200, from(red), to(#000))

阴影效果

text-shadow: rgba(64, 64, 64, 0.5) 0px 0px 0px;
box-shadow: rgba(0, 0, 128, 0.25) 3px 0px 0px;

制作一个LOGO,只需拖动滑动条

text-shadow: rgba(0, 0, 0, 0.5) 0 0px 0px;  

background:
-webkit-gradient(linear, left top, left bottom, from(rgba(200, 200, 240, 0)), to(rgba(255, 255, 255, 0)));

border-radius: 0px;

-webkit-box-reflect: below 10px
-webkit-gradient(linear, left top, left bottom, from(transparent), to(rgba(255, 255, 255, 0)));

更强大的背景

背景的尺寸

#logo {
background
: url(logo.gif) center center no-repeat;
background-size
:
;
}

多个背景

div {
background
: url(src/zippy-plus.png) 10px center no-repeat,
url(src/gray_lines_bg.png) 10px center repeat-x
;
}

变换 - Transitions

#box.left {
margin-left
: 0;
}
#box.right
{
margin-left
: 1000px;
}

document.getElementById('box').className = 'left';
document.getElementById('box').className = 'right';
#box {
-webkit-transition
: margin-left 1s ease-in-out;
}

document.getElementById('box').className = 'left';
document.getElementById('box').className = 'right';

变换 - Transforms

-webkit-transform: rotateY(45deg);            
-webkit-transform: scaleX(25deg);
-webkit-transform: translate3d(0, 0, 90deg);
-webkit-transform: perspective(500px)
#threed-example {
-webkit-transform
: rotateZ(5deg);

-webkit-transition
: -webkit-transform 2s ease-in-out;
}
#threed-example:hover
{
-webkit-transform
: rotateZ(-5deg);
}

动画效果

@-webkit-keyframes pulse {
from {
opacity
: 0.0;
font-size
: 100%;
}
to
{
opacity
: 1.0;
font-size
: 200%;
}
}

div
{
-webkit-animation-name
: pulse;
-webkit-animation-duration
: 2s;
-webkit-animation-iteration-count
: infinite;
-webkit-animation-timing-function
: ease-in-out;
-webkit-animation-direction
: alternate;
}













转载于:https://www.cnblogs.com/hamy/archive/2012/02/21/2362110.html

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