mergeImage: function (src) {

const query = wx.createSelectorQuery();

query

.select('#canvsaMerger')

.fields({

node: true,

size: true,

})

.exec((res) => {

const canvas = res[0].node;

const ctx = canvas.getContext('2d');

const dpr = 2;

// 创建第一张图片

const img1 = canvas.createImage();

img1.src = src;

// 创建第二张图片

const img2 = canvas.createImage();

img2.src = './images/qr-code.png';

// 确保两张图片都加载完成

Promise.all([

new Promise((resolve) => {

img1.onload = resolve;

}),

new Promise((resolve) => {

img2.onload = resolve;

}),

]).then(() => {

let img1Width = img1.width;

let img1Height = img1.height;

// 保持第二张图片的宽高比

let img2Height = img1Width * (img2.height / img2.width);

// 动态计算 OFFSET

const OFFSET = img1Width * 0.2;

// 设置 canvas 临时大小

let canvasWidth = img1Width;

let canvasHeight = img1Height + img2Height - OFFSET;

const maxSize = 3000

// 检查是否需要缩放以保持在最大尺寸范围内

let scaleFactor = 1;

if (canvasWidth * dpr > maxSize || canvasHeight * dpr > maxSize) {

scaleFactor = Math.min(maxSize / (canvasWidth * dpr), maxSize / (canvasHeight * dpr));

}

// 将比例因子应用于画布和图像尺寸

canvasWidth = canvasWidth * scaleFactor;

canvasHeight = canvasHeight * scaleFactor;

img1Width = img1Width * scaleFactor;

img1Height = img1Height * scaleFactor;

img2Height = img2Height * scaleFactor;

// 设置实际画布大小，考虑设备像素比

canvas.width = canvasWidth * dpr;

canvas.height = canvasHeight * dpr;

console.log(canvasWidth, canvasHeight, canvas.width, canvas.height, 'canvas.height')

// 上下文已缩放以考虑 DPR

ctx.scale(dpr, dpr);

// 绘制第一张图像

ctx.drawImage(img1, 0, 0, img1Width, img1Height);

// 将第二张图像绘制在第一张图像下方，并带有偏移量

ctx.drawImage(img2, 0, img1Height - OFFSET * scaleFactor, img1Width, img2Height);

wx.nextTick(() => {

wx.canvasToTempFilePath({

canvas: canvas,

x: 0,

y: 0,

width: canvas.width,

height: canvas.height,

destWidth: canvasWidth,

destHeight: canvasHeight,

fileType: 'png',

quality: 0.01,

success: (res) => {

console.log(res.tempFilePath, 'res.tempFilePath1111')

// wxfile://tmp_54f0f65f3d69825d65c873a7ac502f9d.png

wx.showShareImageMenu({

path: res.tempFilePath,

success: function (res) {

console.log(res, '2-2-2-')

},

fail: function (e) {

console.log(e, '20202020')

},

complete: function (e) {

console.log(e, '20202p2p')

},

});

},

fail: (err) => {

console.error('导出图片失败', err);

},

}, this);

})

});

});

},