fix(legend): remove unexpected syntax to ensure better compatibility.

[plainheart]

Brief Information

This pull request is in the type of:

• bug fixing
• new feature
• others

What does this PR do?

Remove unexpected syntax String.startsWith from LegendView to ensure better compatibility.

This syntax is not supported in IE, so use lastIndexOf(search, 0) === 0 instead.

Fixed issues

N.A.

Details

Before: What was the problem?

The chart cannot be rendered in IE and threw a syntax error about startsWith.

After: How is it fixed in this PR?

Use lastIndexOf(search, 0) === 0 instead.

Misc

• The API has been changed (apache/echarts-doc#xxx).
• This PR depends on ZRender changes (ecomfe/zrender#xxx).

Related test cases or examples to use the new APIs

NA.

Others

Merging options

• Please squash the commits into a single one when merge.

Other information

[echarts-bot]

Thanks for your contribution!
The community will review it ASAP. In the meanwhile, please checkout the coding standard and Wiki about How to make a pull request.

The pull request is marked to be PR: author is committer because you are a committer of this project.

[echarts-bot]

Congratulations! Your PR has been merged. Thanks for your contribution! 👍