这是pc端查看，没问题。
这是真机调试。
代码：
//添加图片
upImg(e) {
let that = this;
wx.showActionSheet({
itemList: ['从相册中选择', '相机'],
itemColor: "#67bae7",
success(res) {
if (res.tapIndex == 0) {
that.chooseWxImage('album')
} else if (res.tapIndex == 1) {
that.chooseWxImage('camera')
}
},
fail(res) {
console.log(res.errMsg)
}
})
},
//上传封面图
chooseWxImage(type) {
var that = this;
var result = {}
var icon = "";
wx.setStorageSync('initFabu', 'false')
wx.chooseImage({
count: 1,
sizeType: ['original', 'compressed'],
sourceType: [type],
success: function (res) {
var imgsrc = res.tempFilePaths[0];
that.setData({
hide: false,
isLoading:true
})
wx.getImageInfo({
src: imgsrc,
success: function (res) {
that.setData({
canvasW:res.width,
canvasH:res.height
});
setTimeout(()=>{
let ctx = wx.createCanvasContext('shuiyinCanvas');
// 打水印
ctx.drawImage(imgsrc, 0, 0, res.width, res.height);
ctx.setFillStyle(ctx.createPattern("https://ytw.oss-cn-beijing.aliyuncs.com/static/image/systemIcon/water_cover.png", "repeat"));
ctx.fillRect(0, 0, res.width, res.height);
ctx.draw(false, function () {
wx.canvasToTempFilePath({
canvasId: 'shuiyinCanvas',
success: (res) => {
let arr = [];
let imgUrl = res.tempFilePath;
arr.push(imgUrl);
wx.showLoading({ title: '等待图片上传...', mask: true });
util.uploadimg({ path: arr, url: "/api/user/uploadFile" }, function (result, currIndex) {
let curr_data = JSON.parse(result);
that.setData({
cover: curr_data.data,
isLoading: false
});
wx.hideLoading();
}, function (err) {
that.setData({
isLoading: false
});
});
},
fail: (err) => {
that.setData({
isLoading: false
});
}
})
});
},200);
}
});
}
})
},
预见相同的问题,pc手写签名图片正常生成图片,真机调试和体验版就出现存黑图片,请问怎么处理?
插入不了代码......
上面是pc插入的图片,下面是真机调试和体验版的图片
麻烦提供能复现问题的代码片段（https://developers.weixin.qq.com/miniprogram/dev/devtools/minicode.html）