How does echarts switch themes

One-line summary [problem brief]
how to switch between topics, is there any way?

Version & Environment [version and environment]
ECharts version [ECharts version]: 4.1.0
Browser version [browser type and version]: Google 67.0.3396.87 (official version)
OS Version [operating system type and version]: Microsoft win 10

Expected behaviour [expected result]
switch topics by method

I can pass in themes when I find init, but how to switch themes after initialization

you can see

in http://gallery.echartsjs.com/..

you can click directly to switch topics, but there is no relevant method found in the document

is there any other documentation related to echarts topic configuration?

Canvas data-visualization css javascript echarts

Mar.20,2021

var chart = echarts.init (dom, 'light'); / / when the table is initialized, it is switched to the light theme

in fact, you can know what to do by looking at the document.

http://echarts.baidu.com/tuto.

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MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1e8a9ac-fed.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1e8a9ac-fed.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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