24 lines
718 B
Markdown
24 lines
718 B
Markdown
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---
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title: Use the .env File
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localeTitle: 使用.env文件
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---
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## 使用.env文件
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我们可以使用.toUpperCase（）方法使字符串全部大写，例如：
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```javascript
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var response = "Hello World".toUpperCase(); // now becomes "HELLO WORLD"
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```
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我们现在需要做的就是检查环境变量的值是什么，你可以这样做：
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```javascript
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if (process.env.VAR_NAME === "allCaps") {
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resonse = "Hello World".toUpperCase();
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} else {
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response = "Hello World";
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}
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});
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```
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[帮助我们的社区扩展这些提示和指南](https://github.com/freecodecamp/guides/tree/master/src/pages/certifications/apis-and-microservices/basic-node-and-express/use-the-.env-file/index.md) 。
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