set environment variables in nuxt3 project

Hi I’m using nuxt3 to develop SSR project!
I want to set environment variables to control the API url.
I set it like this in the scripts of package.json.

"serve-dev": "set ENV=development && nuxt dev",
"serve-prod": "set ENV=production && nuxt dev",

When I console.log the env, I found that the setting is successful.
But the Judgment will log “false”.
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You can find that the first two lines of console.log are correct, but the third line will display an error.

How did this happen.