uniapp通过将page中页面装到预设的html模板中，然后在修改模板中的头部信息即可引用外部资源
1.在项目根目录新建template.h5.html文件
目录结构.png
<!DOCTYPE html>
<html lang="zh-CN">
<head>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<title>
<%= htmlWebpackPlugin.options.title %>
</title>
<!-- <meta property="og:description" content="Description Here" /> -->
<script>
var coverSupport = 'CSS' in window && typeof CSS.supports === 'function' && (CSS.supports('top: env(a)') || CSS.supports('top: constant(a)'))
document.write('<meta name="viewport" content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0' + (coverSupport ? ', viewport-fit=cover' : '') + '" />')
</script>
<link rel="stylesheet" href="<%= BASE_URL %>static/index.<%= VUE_APP_INDEX_CSS_HASH %>.css" />
</head>
<body>
<noscript>
<strong>Please enable JavaScript to continue.</strong>
</noscript>
<div id="app"></div>
<!-- built files will be auto injected -->
</body>
</html>
2.修改manifest.json中的h5字段,引入刚刚预设的模板
manifest.json.png
3.保存修改，如果需要引入外部资源在html问价中修改即可
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