go中都有此关键字,同样的,在Flutter中也是表示不变的意思。具体来看看下面的代码。```Row( children: [ Image(image: NetworkImage('https://flutter.github.io/assets-for-api-docs/assets/widg... 当前页面中重建次数。![](https://p3-juejin.byteimg.com/tos-cn-i-k3u1fbpfcp/a7039bb5462242f2932073fcb561d86f~tplv-k3u1fbpfcp-zoom-1.image)在每个widget之前都有一个小图标,- 黄色旋转圆圈 - 重建次...