watch variable not available

the variable in chrome's watch expression must be used in the local scope or it's declared in the global scope, otherwise it's not available even if it has been declared in closure scope
——stackoverflow

watch variable 试验

首先local scope和global scope的变量肯定可以看，如果是closure sope的变量则必须在当前作用域内使用过，才不会发生not available
https://developers.google.com/web/tools/chrome-devtools/javascript/watch-variables

Dev Tool 是可以字体放大的

先聚焦然后⌘+

如何反复观看动画？

有时候看到一个动画做的非常棒，想效仿，那就肯定得先反复玩味几遍。
animation-name中的勾uncheck→check就可以了。

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