把两张图片利用canvas合并。然后下载，直接看代码吧，凑字数到100字,直接看代码吧，凑字数到100字,直接看代码吧，凑字数到100字,直接看代码吧，凑字数到100字,直接看代码吧，凑字数到100字,直接看代码吧，凑字数到100字,直接看代码吧，凑字数到100字直接看代码吧，凑字数到100字直接看代码吧，凑字数到100字
downWifiImg(){
var that=this
uni.downloadFile({
url:that.qrcode,//网络图片的地址
success:function(res){
const img2=res.tempFilePath;
const systemInfo = uni.getSystemInfoSync()
// 获取视口宽度
const viewportWidth = systemInfo.windowWidth
// 获取视口高度
const viewportHeight = 700
const ctx = uni.createCanvasContext('myCanvas')
console.log(viewportWidth,viewportHeight);
ctx.drawImage('/static/share/bg.jpg', 0, 0, viewportWidth, viewportHeight)
ctx.drawImage(img2,(viewportWidth-250)/2, (viewportHeight-250)/2,250, 250)
ctx.draw(false, () => {
uni.canvasToTempFilePath({
canvasId: 'myCanvas',
success: (res) => {
console.log(res.tempFilePath);
that.mergedImage = res.tempFilePath;
uni.saveImageToPhotosAlbum({
filePath: res.tempFilePath,
success: function () {
uni.showToast({
title:'保存成功'
})
console.log('save success');
},
fail(err){console.log('执行完了',err);},
complete(){
console.log('执行完了');
}
});
}
});
});
},
fail:function(res){
console.log('保存错误',res);
},
})
},
