版本：
文件：
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https://cdn.bootcdn.net/ajax/libs/signature_pad/4.1.6/signature_pad.js
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https://cdn.bootcdn.net/ajax/libs/signature_pad/4.1.6/signature_pad.js.map
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https://cdn.bootcdn.net/ajax/libs/signature_pad/4.1.6/signature_pad.min.js
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https://cdn.bootcdn.net/ajax/libs/signature_pad/4.1.6/signature_pad.min.js.map
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https://cdn.bootcdn.net/ajax/libs/signature_pad/4.1.6/signature_pad.umd.js
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https://cdn.bootcdn.net/ajax/libs/signature_pad/4.1.6/signature_pad.umd.js.map
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https://cdn.bootcdn.net/ajax/libs/signature_pad/4.1.6/signature_pad.umd.min.js
-
https://cdn.bootcdn.net/ajax/libs/signature_pad/4.1.6/signature_pad.umd.min.js.map