码迷,mamicode.com
首页 > Web开发 > 详细

HTML5学习笔记

时间:2015-06-26 19:34:54      阅读:149      评论:0      收藏:0      [点我收藏+]

标签:

1.视频

<video src="test.mp4" controls="controls">

controls属性用来控制控件的显示

<!DOCTYPE html> 
<html> 
<body> 

<div style="text-align:center;">
  <button onclick="playPause()">播放/暂停</button> 
  <button onclick="makeBig()"></button>
  <button onclick="makeNormal()"></button>
  <button onclick="makeSmall()"></button>
  <br /> 
  <video id="video1" width="420" style="margin-top:15px;">
    <source src="/example/html5/mov_bbb.mp4" type="video/mp4" />
    <source src="/example/html5/mov_bbb.ogg" type="video/ogg" />
    Your browser does not support HTML5 video.
  </video>
</div> 

<script type="text/javascript">
var myVideo=document.getElementById("video1");

function playPause()
{ 
if (myVideo.paused) 
  myVideo.play(); 
else 
  myVideo.pause(); 
} 

function makeBig()
{ 
myVideo.width=560; 
} 

function makeSmall()
{ 
myVideo.width=320; 
} 

function makeNormal()
{ 
myVideo.width=420; 
} 
</script> 

</body> 
</html>

  控制视频显示大小,暂停/播放视频。

 

2.音频

<audio src="song.mp3" controls="controls">

  controls方法同上。

 

3.拖放

<!DOCTYPE HTML>
<html>
<head>
<style type="text/css">
#div1 {width:488px;height:70px;padding:10px;border:1px solid #aaaaaa;}
</style>
<script type="text/javascript">
function allowDrop(ev)
{
ev.preventDefault();
}

function drag(ev)
{
ev.dataTransfer.setData("Text",ev.target.id);
}

function drop(ev)
{
ev.preventDefault();
var data=ev.dataTransfer.getData("Text");
ev.target.appendChild(document.getElementById(data));
}
</script>
</head>
<body>

<p>请把 W3School 的图片拖放到矩形中:</p>

<div id="div1" ondrop="drop(event)" ondragover="allowDrop(event)"></div>
<br />
<img id="drag1" src="/i/w3school_banner.gif" draggable="true" ondragstart="drag(event)" />

</body>
</html>

 

4.web存储

web存储主要借助JavaScript。以下的例子是用来统计用户访问网站的次数。

<script type="text/javascript">
if (localStorage.pagecount)
  {
  localStorage.pagecount=Number(localStorage.pagecount) +1;
  }
else
  {
  localStorage.pagecount=1;
  }
document.write("Visits "+ localStorage.pagecount + " time(s).");
</script>

  当用sessionStorage代替localStorage时,只要用户关闭浏览器,数据清零。

 

5.应用程序缓存

<!DOCTYPE HTML>
<html manifest="demo.appcache">
...
</html>

  如此操作时,可供离线浏览。下次加载时,只加载更新的部分,节省服务器开销,速度更快。

 

6.web worker

<!DOCTYPE html>
<html>
<body>

<p>计数: <output id="result"></output></p>
<button onclick="startWorker()">开始 Worker</button> 
<button onclick="stopWorker()">停止 Worker</button>
<br /><br />

<script>
var w;

function startWorker()
{
if(typeof(Worker)!=="undefined")
  {
  if(typeof(w)=="undefined")
  {
  w=new Worker("/example/html5/demo_workers.js");
  }
  w.onmessage = function (event) {
    document.getElementById("result").innerHTML=event.data;
    };
  }
else
  {
  document.getElementById("result").innerHTML="Sorry, your browser does not support Web Workers...";
  }
}

function stopWorker()
{ 
w.terminate();
}
</script>

</body>
</html>

 

  web worker在后台运行,不会影响到其他脚本。web worker多用于耗费CPU多的项目。

 

7.服务器发送事件

<script>
if(typeof(EventSource)!=="undefined")
  {
  var source=new EventSource("/example/html5/demo_sse.php");
  source.onmessage=function(event)
    {
    document.getElementById("result").innerHTML+=event.data + "<br />";
    };
  }
else
  {
  document.getElementById("result").innerHTML="Sorry, your browser does not support server-sent events...";
  }
</script>

 

  对应的PHP

<?php
header(‘Content-Type: text/event-stream‘);
header(‘Cache-Control: no-cache‘);

$time = date(‘r‘);
echo "data: The server time is: {$time}\n\n";
flush();
?>

 

8.input 类型

<input type="email" name="user_email" />

email可以换成number,url等。

 

9.datalist是规定输入域的选项列表

<!DOCTYPE HTML>
<html>
<body>

<form action="/example/html5/demo_form.asp" method="get">
Webpage: <input type="url" list="url_list" name="link" />
<datalist id="url_list">
    <option label="W3School" value="http://www.w3school.com.cn" />
    <option label="Google" value="http://www.google.com" />
    <option label="Microsoft" value="http://www.microsoft.com" />
</datalist>
<input type="submit" />
</form>

</body>
</html>

 

HTML5学习笔记

标签:

原文地址:http://www.cnblogs.com/linzb1993/p/4602944.html

(0)
(0)
   
举报
评论 一句话评论(0
登录后才能评论!
© 2014 mamicode.com 版权所有  联系我们:gaon5@hotmail.com
迷上了代码!