canavs下png图转jpg后的黑色背景实例页面
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代码:
HTML代码:
<canvas width="165" height="165"></canvas>
JS代码:
var canvas = document.querySelector('canvas'); var context = canvas.getContext('2d'); var img = new Image(), img2 = new Image(); img.onload = function () { context.drawImage(this, 0, 0, 165, 165); // 转jpg格式 img2.src = canvas.toDataURL('image/jpeg'); canvas.parentNode.append(img2); }; img.src = './riziyan-favicon.png';