版本：
文件：
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https://cdn.bootcdn.net/ajax/libs/bootstrap-formhelpers/2.3.0/css/bootstrap-formhelpers.css
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https://cdn.bootcdn.net/ajax/libs/bootstrap-formhelpers/2.3.0/css/bootstrap-formhelpers.min.css
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https://cdn.bootcdn.net/ajax/libs/bootstrap-formhelpers/2.3.0/img/bootstrap-formhelpers-countries.flags.png
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https://cdn.bootcdn.net/ajax/libs/bootstrap-formhelpers/2.3.0/img/bootstrap-formhelpers-currencies.flags.png
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https://cdn.bootcdn.net/ajax/libs/bootstrap-formhelpers/2.3.0/img/bootstrap-formhelpers-googlefonts.png
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https://cdn.bootcdn.net/ajax/libs/bootstrap-formhelpers/2.3.0/js/bootstrap-formhelpers.js
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https://cdn.bootcdn.net/ajax/libs/bootstrap-formhelpers/2.3.0/js/bootstrap-formhelpers.min.js