版本：
文件：
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https://cdn.bootcdn.net/ajax/libs/sketchpad/0.1.0/scripts/initialize.js
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https://cdn.bootcdn.net/ajax/libs/sketchpad/0.1.0/scripts/initialize.min.js
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https://cdn.bootcdn.net/ajax/libs/sketchpad/0.1.0/scripts/initialize.min.js.map
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https://cdn.bootcdn.net/ajax/libs/sketchpad/0.1.0/scripts/sketchpad.js
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https://cdn.bootcdn.net/ajax/libs/sketchpad/0.1.0/scripts/sketchpad.min.js
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https://cdn.bootcdn.net/ajax/libs/sketchpad/0.1.0/scripts/sketchpad.min.js.map
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https://cdn.bootcdn.net/ajax/libs/sketchpad/0.1.0/styles/sketchpad.css