echart也是基于canvas话的，那为什么canvas直接画图不能显示呢 #261
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那个 issue 里的 echarts 看起来是在用 SVG renderer？ |
Yuyz0112
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close #60, #261 This patch implements the canvas mutation observer. It consists of both the record and the replay side changes. In the record side, we add a `recordCanvas` flag to indicate whether to record canvas elements and the flag defaults to false. Different from our other observers, the canvas observer was disabled by default. Because some applications with heavy canvas usage may emit a lot of data as canvas changed, especially the scenarios that use a lot of `drawImage` API. So the behavior should be audited by users and only record canvas when the flag was set to true. In the replay side, we add a `UNSAFE_replayCanvas` flag to indicate whether to replay canvas mutations. Similar to the `recordCanvas` flag, `UNSAFE_replayCanvas` defaults to false. But unlike the record canvas implementation is stable and safe, the replay canvas implementation is UNSAFE. It's unsafe because we need to add `allow-scripts` to the replay sandbox, which may cause some unexpected script execution. Currently, users should be aware of this implementation detail and enable this feature carefully.
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Yuyz0112
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* record canvas mutations close #60, #261 This patch implements the canvas mutation observer. It consists of both the record and the replay side changes. In the record side, we add a `recordCanvas` flag to indicate whether to record canvas elements and the flag defaults to false. Different from our other observers, the canvas observer was disabled by default. Because some applications with heavy canvas usage may emit a lot of data as canvas changed, especially the scenarios that use a lot of `drawImage` API. So the behavior should be audited by users and only record canvas when the flag was set to true. In the replay side, we add a `UNSAFE_replayCanvas` flag to indicate whether to replay canvas mutations. Similar to the `recordCanvas` flag, `UNSAFE_replayCanvas` defaults to false. But unlike the record canvas implementation is stable and safe, the replay canvas implementation is UNSAFE. It's unsafe because we need to add `allow-scripts` to the replay sandbox, which may cause some unexpected script execution. Currently, users should be aware of this implementation detail and enable this feature carefully. * update canvas integration test
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恩，因为 DOM 的 style 在不断变化。
按现在的录制方式，能够保证回放的时候的还原度。也可以通过一些配置来减低还原时的效果，但是减少数据量。
你比较期望什么样的效果呢？比如是 tooltip 的移动看起来没那么流程（throttle 忽略一些 style 变化），或者是不需要看到 tooltip？
Originally posted by @Yuyz0112 in #197 (comment)
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