flutter for web, when I call "webViewController!.addJavaScriptHandler",but show err "addJavaScriptHandler is not implemented on the current platform",for android and iOS is ok?

[yuxingmin]

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• [x] I have already searched for the same problem

Environment

Technology	Version
Flutter version
Plugin version
Android version
iOS version
macOS version
Xcode version
Google Chrome version

Device information:

Description

Expected behavior:

Current behavior:

Steps to reproduce

1. This
2. Than that
3. Then

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Stacktrace/Logcat