版本：
文件：
-
https://cdn.bootcdn.net/ajax/libs/signature_pad/4.1.5/signature_pad.js
-
https://cdn.bootcdn.net/ajax/libs/signature_pad/4.1.5/signature_pad.js.map
-
https://cdn.bootcdn.net/ajax/libs/signature_pad/4.1.5/signature_pad.min.js
-
https://cdn.bootcdn.net/ajax/libs/signature_pad/4.1.5/signature_pad.min.js.map
-
https://cdn.bootcdn.net/ajax/libs/signature_pad/4.1.5/signature_pad.umd.js
-
https://cdn.bootcdn.net/ajax/libs/signature_pad/4.1.5/signature_pad.umd.js.map
-
https://cdn.bootcdn.net/ajax/libs/signature_pad/4.1.5/signature_pad.umd.min.js
-
https://cdn.bootcdn.net/ajax/libs/signature_pad/4.1.5/signature_pad.umd.min.js.map