fix: 修复签名组件在微信基础库3.7.8的兼容性问题 (#735) #739
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canvasToTempFilePath 接口在微信基础库3.7.8上抛出异常，导致签名组件不可用，改用 base64 + base64ToArrayBuffer 接口实现。 参考： https://developers.weixin.qq.com/community/develop/doc/0008022ea30318366fe25b3596b800
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这个 PR 做了什么? (简要描述所做更改)
签名组件 signature 使用了 canvasToTempFilePath 接口在微信基础库3.7.8上抛出异常，导致签名组件不可用，改用 base64 + base64ToArrayBuffer 接口实现。
参考：
https://developers.weixin.qq.com/community/develop/doc/0008022ea30318366fe25b3596b800
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