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我想问你我下面的代码有什么问题:

var myCanvas = document.getElementById('myCanvas');
var ctx = myCanvas.getContext('2d');

var image = new Image();
image.onload = onLoad;
image.src = './PS_Countdown.jpeg';
ctx.drawImage(image, 25, 25);

function onLoad() {
    console.log('Image loaded');
}
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