wf123537200 opened a new pull request #12504:
URL: https://github.com/apache/incubator-echarts/pull/12504
## Brief Information
add config as follow to control tooltip.formatter function trigger only once
or not
```
tooltip: {
triggerOnce: true, // 如果配置为true，formatter函数只触发一次
...
},
```
This pull request is in the type of:
- [ ] bug fixing
- [x] new feature
- [ ] others
### What does this PR do?
Control whether the tooltip.formatter function is triggered only once
through configuration items, used to reduce the number of high-cost function
executions
### Fixed issues
#12338
## Details
### Before: What was the problem?
the formatter function trigger many times
### After: How is it fixed in this PR?
when set triggerOnce: true， each formatter function trigger only once
## Usage
### Are there any API changes?
- [x] The API has been changed.
```
tooltip: {
triggerOnce: true, // 如果配置为true，formatter函数只触发一次
...
},
```
### Related test cases or examples to use the new APIs
/test/tooltip-formatter-triggerOnce.html
## Others
### Merging options
- [ ] Please squash the commits into a single one when merge.
### Other information
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