全局变量校验

chameleon的代码最终会运行在多端框架中，每一个端都会有一些特有的全局变量，chameleon内部维护了一个各端全局变量的散列表如下表所示。

全局变量校验校验的是某一端运行的代码中存在其他端的全局变量并且不是当前端的全局变量。例如非微信小程序端的代码中不能出现wx全局变量，非百度小程序的代码中不能出现swan全局变量。

可以通过项目配置决定是否开启全局变量校验，还可以配置哪些文件是白名单文件不进行校验。

端全局变量
微信小程序["wx"]
百度小程序["swan"]
weex["weex"]
支付宝小程序["my"]
web
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