增加大华sdk依赖库

‘liusuyi’

2023-10-16 c53a2ea070b48ecd9fbdba1f0851510a01efef89

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var userAgent = require('../internals/engine-user-agent');
 
var firefox = userAgent.match(/firefox\/(\d+)/i);
 
module.exports = !!firefox && +firefox[1];