var url = canvas.toDataURL();
var myimg=document.getElementById('myimg');
myimg.src = url;
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<!DOCTYPE HTML>
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<html>
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<body>
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<canvas id="myCanvas" width="200" height="100" style="border:1px solid #c3c3c3;">
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Your browser does not support the canvas element.
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</canvas>
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<input type="button" name="button" value="button" onclick="convertCanvasToImage()"/>
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<image src="" alt="" id="myimg" width="100px;" height="100px;"/>
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<script type="text/javascript">
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var c=document.getElementById("myCanvas");
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var cxt=c.getContext("2d");
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cxt.moveTo(10,10);
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cxt.lineTo(150,50);
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cxt.lineTo(10,50);
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cxt.stroke();
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</script>
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<script type="text/javascript">
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function convertCanvasToImage() {
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alert(22);
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var canvas = document.getElementById('myCanvas');
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var url = canvas.toDataURL();
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var myimg=document.getElementById('myimg');
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myimg.src = url;
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}
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</script>
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</body>
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</html>
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