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安徽农业变革：从依赖自然到运用科技精准耕作
For example, I am a maintainer of chai, and we have this exact issue. We need to support assertions happening across realms (since a test runner may run tests in a VM or iframe), so we can’t rely on instanceof checks. For that reason, we use Object.prototype.toString.call(val) === '[object RegExp]' to check if something is a regex, which works across realms since it doesn’t rely on the constructor.