wx.canvasToTempFilePath({ canvasId: id, x: x, y: y, width: width, height: height, destWidth: width / deviceRadio, destHeight: height / deviceRadio, success: function success(res) { console.log('success'); typeof args[args.length - 1] === 'function' && args[args.length - 1](res.tempFilePath); }, fail: function fail(res) { console.log('fail'); console.log(res); } });break;