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clone react sourcecode
切到分支17.9.2
yarn build react/index,react-dom/index --type=UMD
# 不需要 yarn install
# chrome dev tool 选中元素
# you can click on a DOM element, when you click on a DOM element, “== $0” appears after it.
# $0 等效 document.querySelector 选中的元素
dev tool 源代码，按esc，出现控制台，可以打印源代码运行过程中设置的变量 `$0.xxx`
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