小提琴：http://liveweave.com/LHfsld
小提琴：http://jsbin.com/xutivucanaye/1/edit
这不是最好的解决办法，有点怪诞，但我得到它的工作。好样的。
它不带有嵌入式图像，iframe中运行，它会永远有全面的CSS支持（你可以阅读为什么从html2canvas's FAQ）
这里是我的整个片段：
<!DOCTYPE html>
<html>
<head>
<title>Snap a Picture of Preview</title>
<meta charset='utf-8'>
<meta name='viewport' content='initial-scale=1.0'>
<meta http-equiv='X-UA-Compatible' content='IE=9' />
<link type='text/css' rel='stylesheet' href='http://necolas.github.io/normalize.css/3.0.1/normalize.css'/>
<script type='text/javascript' src='http://code.jquery.com/jquery-latest.min.js'></script>
<script src='https://raw.github.com/niklasvh/html2canvas/gh-pages/build/html2canvas.js'></script>
<script src='http://codemirror.net/lib/codemirror.js'></script>
<script src='http://codemirror.net/mode/xml/xml.js'></script>
<script src='http://codemirror.net/mode/javascript/javascript.js'></script>
<script src='http://codemirror.net/mode/css/css.js'></script>
<script src='http://codemirror.net/mode/htmlmixed/htmlmixed.js'></script>
<link rel='stylesheet' href='http://codemirror.net/lib/codemirror.css'>
<link rel='stylesheet' href='http://codemirror.net/doc/docs.css'>
<script src='http://codemirror.net/mode/htmlmixed/htmlmixed.js'></script>
<script src='http://codemirror.net/addon/edit/closetag.js'></script>
<script src='http://codemirror.net/addon/edit/matchbrackets.js'></script>
<script src='http://codemirror.net/addon/selection/active-line.js'></script>
<style type='text/css'>
.CodeMirror {
float: left;
width: 50%;
border: 1px solid black;
}
iframe {
width: 49%;
float: left;
height: 300px;
border: 1px solid black;
border-left: 0;
}
#beforeiframesnap {
position: absolute;
top: -500000px;
left: -500000px;
width: 0;
height: 0;
opacity: 0;
overflow: hidden;
}
</style>
</head>
<body>
<div align='center'>
<button class='snapFrame'>Snap</button>
</div>
<textarea id='code' name='code'><!DOCTYPE html>
<html>
<head>
<meta charset=utf-8>
<title>HTML5 canvas demo</title>
<style>p {font-family: monospace;}</style>
</head>
<body>
<p>Canvas pane goes here:</p>
<canvas id=pane width=300 height=200></canvas>
<script>
var canvas = document.getElementById('pane');
var context = canvas.getContext('2d');
context.fillStyle = 'rgb(250,0,0)';
context.fillRect(10, 10, 55, 50);
context.fillStyle = 'rgba(0, 0, 250, 0.5)';
context.fillRect(30, 30, 55, 50);
</script>
</body>
</html></textarea>
<textarea id='beforeiframesnap'></textarea>
<iframe id='preview'></iframe>
<div id='imgprev'></div>
<script type='text/javascript'>
$('#beforeiframesnap').val("");
// Append JS library to HTML <head>
function appendJSLib(txt) {
var textArea = editor.getValue();
var searchText = textArea.search('<head>');
if(searchText>0) {
txt = '<head>'+'\n'+txt;
var updatedTextArea = textArea.replace('<head>',txt);
editor.setValue(updatedTextArea);
}
else {
reset();
alert('WARNING! The <head> tag seems to be missing in your HTML. Although your code may still work, we highly recommened that you have a valid HTML syntax. Please refer to the new document of correct formatted');
txt = txt+textArea;
htmlEditor.setLine(0, txt);
return false;
}
}
// Append script to HTML <body>
function appendScript(txt) {
var textArea = editor.getValue();
var searchText = textArea.search('<body>');
if(searchText>0) {
txt = '<body>'+'\n'+txt;
var updatedTextArea = textArea.replace('<body>',txt);
editor.setValue(updatedTextArea);
}
else {
reset();
alert('WARNING! The <body> tag seems to be missing in your HTML. Although your code may still work, we highly recommened that you have a valid HTML syntax. Please refer to the new document of correct formatted');
txt = txt+textArea;
htmlEditor.setLine(0, txt);
return false;
}
}
$('.snapFrame').on('click', function() {
$('#beforeiframesnap').val("").val(editor.getValue());
txt = '<'+'script type=\'text/javascript\' src=\'http://code.jquery.com/jquery-latest.min.js\'>'+'</'+'script'+'>';
appendJSLib(txt);
txt = '<'+'script type=\'text/javascript\' src=\'https://raw.github.com/niklasvh/html2canvas/gh-pages/build/html2canvas.js\'>'+'</'+'script'+'>';
appendJSLib(txt);
txt = '<'+'script type=\'text/javascript\'>\n$(document).ready(function() {\n html2canvas($(\'body\'), {\n onrendered: function(canvas) {\n var myImage = canvas.toDataURL(\'image/png\');\n $(\'body\').html(\'<img src=\'+ myImage +\' />\'); window.open(\'javascript:document.write("<img src=\'+ myImage +\' />")\', \'Opened Page\', \'width=660, height=440\');\n }\n });\n});\n</'+'script'+'>';
appendScript(txt);
setTimeout(function() {
editor.setValue($('#beforeiframesnap').val());
}, 1200);
});
var delay;
// Initialize CodeMirror editor
var editor = CodeMirror.fromTextArea(document.getElementById('code'), {
mode: 'text/html',
tabMode: 'indent',
styleActiveLine: true,
lineNumbers: true,
lineWrapping: true,
autoCloseTags: true
});
// Live preview
editor.on('change', function() {
clearTimeout(delay);
delay = setTimeout(updatePreview, 300);
});
function updatePreview() {
var previewFrame = document.getElementById('preview');
var preview = previewFrame.contentDocument || previewFrame.contentWindow.document;
preview.open();
preview.write(editor.getValue());
preview.close();
}
setTimeout(updatePreview, 300);
</script>
</body>
</html>