在vue cli 创建的项目里面， 设置环境变量，报错 not defined问题出现的环境背景及自己尝试过哪些方法相关代码// 请把代码文本粘贴到下方（请勿用图片代替代码）\//.env 文件 VUE_APP_TITLE=测试标题 // public/index.html <!DOCTYPE html> <html> <head> <meta charset="utf-8"> <meta http-equiv="X-UA-Compatible" content="IE=edge"> <meta name="viewport" content="width=device-width,initial-scale=1.0"> <link rel="icon" href="<%= BASE_URL %>favicon.ico"> <title><%= VUE_APP_TITLE %></title> </head> <body> <noscript> <strong>We're sorry but vue-test-3 doesn't work properly without JavaScript enabled. Please enable it to continue.</strong> </noscript> <div id="app"></div> <!-- built files will be auto injected --> </body> </html>期望页面title显示"测试标题"，但是有报错"ReferenceError: VUE_APP_TITLE is not defined"
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