早期使用FacebookReactJS。简单的CSS淡入过渡。它与ReactJSv0.5.1一起按预期工作。它不适用于v11.1、v12.0、v12.1。这是CSS和JSX:CSS.example-enter{opacity:0.01;transition:opacity.5sease-in;}.example-enter.example-enter-active{opacity:1;}.example-leave{opacity:1;transition:opacity.5sease-in;}.example-leave.example-leave-active{opacity:0.