sublink无效

[leohazy]

Version

4.8.0

Steps to reproduce

1. sublink not work

the sublink cannot open ，but title link function well。such as the example in https://echarts.apache.org/examples/zh/editor.html?c=map-HK， sublink is not work，if change to link，function well，after this ,change to sublink again, sublink can work。

副标题链接无法打开，改成主标题链接则可以打开，此时再改为副标题链接则可以正常打开。

2. 'www.xxxx' link not work

in the case https://echarts.apache.org/examples/zh/editor.html?c=map-HK,set the sublink to <www.baidu.com>,the sublink refer to https://echarts.apache.org/examples/zh/undefined,change sublink to link, it refer to https://echarts.apache.org/examples/zh/www.baidu.com. if set the link to http://www.baidu.com,funtion well。

如果把上述例子中的链接改为<www.baidu.com>时，sublink改为link的时候仍然无法打开，会跳转到https://echarts.apache.org/examples/zh/www.baidu.com，但是改为http://www.baidu.com，则可以正常跳转

What is expected?

click sublink to jump to the specific link

What is actually happening?

jump to an undefined page

[echarts-bot]

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[plainheart]

It is indeed a bug that sublink does not work, but www.xxx may be not.
This feature uses window.open to open the links, if no protocol is specified for url, the browser will open it by current context path.

[leohazy]

It is indeed a bug that sublink does not work, but www.xxx may be not.
This feature uses window.open to open the links, if no protocol is specified for url, the browser will open it by current context path.

got it ,thx! hope fix this sublink bug

[plainheart]

Thanks for your reporting. It has been fixed in #12842.