要使用HTML5 Canvas设置图像的大小，我们可以向drawImage（）方法，width和height添加两个额外的参数。
html代码：
<!DOCTYPE HTML>
<html>
<head>
<style>
body {
margin: 0px;
padding: 0px;
}
</style>
</head>
<body>
<canvas id="myCanvas" width="578" height="200"></canvas>
<script>
var canvas = document.getElementById('myCanvas');
var context = canvas.getContext('2d');
var x = 188;
var y = 30;
var width = 200;
var height = 137;
var imageObj = new Image();
imageObj.onload = function() {
context.drawImage(imageObj, x, y, width, height);
};
imageObj.src = 'https://www.html5canvastutorials.com/demos/assets/darth-vader.jpg';
</script>
</body>
</html>
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