版本：
文件：
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https://cdn.bootcdn.net/ajax/libs/drawingboard.js/0.4.6/drawingboard.css
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https://cdn.bootcdn.net/ajax/libs/drawingboard.js/0.4.6/drawingboard.js
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https://cdn.bootcdn.net/ajax/libs/drawingboard.js/0.4.6/drawingboard.min.css
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https://cdn.bootcdn.net/ajax/libs/drawingboard.js/0.4.6/drawingboard.min.js
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https://cdn.bootcdn.net/ajax/libs/drawingboard.js/0.4.6/drawingboard.nocontrol.css
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https://cdn.bootcdn.net/ajax/libs/drawingboard.js/0.4.6/drawingboard.nocontrol.js
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https://cdn.bootcdn.net/ajax/libs/drawingboard.js/0.4.6/drawingboard.nocontrol.min.css
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https://cdn.bootcdn.net/ajax/libs/drawingboard.js/0.4.6/drawingboard.nocontrol.min.js