zone-evergreen.js
触发产品数据的加载：
url：https://spartacus-dev0.eastus.cloudapp.azure.com:9002/occ/v2/electronics-spa/products/300938?fields=code,name,summary,price(formattedValue),images(DEFAULT,galleryIndex)&lang=zh&curr=USD
Zone是一个执行上下文，能够在多个异步任务之间持久化。可以将其类比成为JavaScript VM设计的thread-local storage.
A Zone is an execution context that persists across async tasks. You can think of it as thread-local storage for JavaScript VMs.
So, without zones, we don’t get any change detection, so we don’t get any of the nice UI updates that we’d expect!
没有zone-evergreen就没有change detection.
更多Jerry的原创文章，尽在：“汪子熙”: