wx.canvasGetImageData()获取的像素点都是0
代码如下，我将拍到的照片输出到画布，目的是想获得图片的图像像素点数据，可是输出的data都是零，求解
this.ctx.takePhoto({ quality: 'high', success: (res) => { const page = wx.createCanvasContext('idcard'); page.drawImage(res.tempImagePath); page.draw(true,wx.canvasGetImageData({ canvasId: 'idcard', x: 0, y: 0, width: 300, height: 400, success: function (e) { console.log(e) } })); }}) |
