ctx.draw(true,(()=>{ console.log("准备生成"+res) setTimeout(()=>{ uni.canvasToTempFilePath({ canvasId: 'myCanvas', fileType: 'png', destWidth: WIDTH, destHeight: HEIGHT, success: function(res) { console.log("生成成功"+res.tempFilePath); uni.hideLoading(); successFn && successFn(res.tempFilePath); } }) },1000)     })()); 回调了，但是报错了下方 麻烦看一下 (found in <Root>) [Vue warn]: Invalid handler for event "click": got undefined (found in <Root>)