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並前往https://www.bennadel.com/blog/3580-using-pure-pipes-to-generate-ngfor-trackby-identity-functions-for-mixed-collections-in-angular-7-2-7.htm

Using Pure Pipes To Generate NgFor TrackBy ... - Ben Nadel

And, while I'm at it, I wanted to allow a special property name, "$index", to be provided as a means to use the collection index as the object ...

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