zoukankan      html  css  js  c++  java
  • [ html drawImage 图片预加载 ] canvas绘制图片 drawImage 属性实例演示之三--使用New Image()进行图片预加载

     1 <!DOCTYPE html>
     2 <html lang='zh-cn'>
     3 <head>
     4 <title>Insert you title</title>
     5 <meta name='description' content='this is my page'>
     6 <meta name='keywords' content='keyword1,keyword2,keyword3'>
     7 <meta http-equiv='Content-Type' content='text/html; charset=utf-8'>
     8 <link rel='stylesheet' type='text/css' href='./css/index.css' />
     9 <script type='text/javascript' src='./js/jquery-1.12.1.min.js'></script>
    10 <style type='text/css'>
    11 html,body {
    12     margin: 0; padding: 0;
    13 }
    14 
    15 html {
    16     height: 100%;
    17 }
    18 
    19 body {
    20     background: #000;
    21 }
    22 
    23 #can {
    24     background: #FFF; display: block; margin: 25px auto; border-radius: 2px;
    25 }
    26 </style>
    27 <script type='text/javascript'>
    28     var oCan = null , oImg = null;
    29     $( function(){
    30         oCan = $( '#can' ).get( 0 ).getContext( '2d' );
    31         var oImg = new Image();
    32         oImg.src = './images/demoImg.jpg';
    33         oImg.onload = function(){
    34             oCan.drawImage( oImg , 0 , 0 , oImg.width / 2 , oImg.height / 2 );
    35         };
    36     } );
    37 </script>
    38 </head>
    39 <body>
    40     <canvas id='can' width='500' height='450'>检测到您的浏览器版本过低请升级您的浏览器以获取更好的使用体验...</canvas>
    41 </body>
    42 </html>
  • 相关阅读:
    TCP心跳 | TCP keepAlive(转)
    闲说HeartBeat心跳包和TCP协议的KeepAlive机制
    一个DNS统计,RCFs,工具站点
    JMX
    【转】如何实现一个配置中心
    用Netty开发中间件:高并发性能优化
    UDP server & client
    DNS缓存
    C正则库做DNS域名验证时的性能对比
    DNS压力测试工具dnsperf简介
  • 原文地址:https://www.cnblogs.com/mysearchblog/p/5928772.html
Copyright © 2011-2022 走看看