js实现二维码包含logo背景图
时间: 2023-05-11 19:06:38 浏览: 79
可以使用第三方库qrcode.js来实现二维码的生成,然后使用canvas将logo和背景图合并到二维码上。以下是示例代码:
```javascript
// 生成二维码
var qrcode = new QRCode(document.getElementById("qrcode"), {
text: "https://www.example.com",
width: 256,
height: 256,
colorDark : "#000000",
colorLight : "#ffffff",
correctLevel : QRCode.CorrectLevel.H
});
// 加载logo和背景图
var logo = new Image();
logo.src = "logo.png";
var bg = new Image();
bg.src = "bg.png";
// 合并logo和背景图到二维码上
logo.onload = function() {
bg.onload = function() {
var canvas = document.createElement("canvas");
canvas.width = qrcode._oDrawing._elCanvas.width;
canvas.height = qrcode._oDrawing._elCanvas.height;
var ctx = canvas.getContext("2d");
ctx.drawImage(qrcode._oDrawing._elCanvas, 0, 0);
ctx.drawImage(bg, 0, 0);
ctx.drawImage(logo, (canvas.width - logo.width) / 2, (canvas.height - logo.height) / 2);
document.getElementById("qrcode").innerHTML = "";
document.getElementById("qrcode").appendChild(canvas);
}
}
```
注意:上述代码中的logo.png和bg.png需要替换成实际的图片路径。