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如果你在自定义组件使用wx.canvasGetImageData({...},this)，wx.canvascreateCanvasContext({...},this)等API，后面都要加一个this参数,文档有写，但真是不明显...
wx.canvasGetImageData 无法获取象素https://developers.weixin.qq.com/miniprogram/dev/api/canvas/wx.canvasGetImageData.html wx.canvasGetImageData({ canvasId: 'canvasBox', x: 0, y: 0, width: 100, height: 100, success(res) { console.log(res.width) // 100 console.log(res.height) // 100 console.log(res.data instanceof Uint8ClampedArray) // true console.log(res.data.length) // 100 * 100 * 4 }, complete(res) { console.log( res ) } }) {errMsg: "canvasGetImageData: fail canvas is empty"} api不生效
2021-01-05