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  • [ html drawImage 绘制图片 ] canvas绘制图片 drawImage 属性实例演示之二

     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 
    27 img {
    28     -moz-user-select: none;
    29 }
    30 </style>
    31 <script type='text/javascript'>
    32     var oCan = null;
    33     var oImg = null;
    34     $( function(){
    35         oCan = $( '#can' ).get( 0 ).getContext( '2d' );
    36         /* 在这里需要注意的就是我们的drawImg()不能将其放置在jquery中,因为jquery的$(document).ready(function(){})有等待页面加载完成之后在加载JS文件的功效,而我们又告诉HTML文档要预加载图片所以他们无法同时使用: 报错内容是drawImg()为define*/
    37         oImg = $( 'img' ).get( 0 );    
    38     } );
    39     function drawImg(){
    40         oCan.drawImage( oImg , 0 , 0 , oImg.width , oImg.height );
    41     }
    42 </script>
    43 </head>
    44 <body onload='drawImg()'>
    45     <canvas id='can' width='500' height='450'>您的浏览器版本过低请升级您的浏览器以获取更好的用户体验...</canvas>
    46     <img src='./images/demoImg.jpg' width='25%' height='15%' />
    47 </body>
    48 </html>
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  • 原文地址:https://www.cnblogs.com/mysearchblog/p/5928324.html
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