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並前往https://docs.sencha.com/gxt/4.x/javadoc/gwt-elemental-2.8.2/elemental/ranges/Range.html

Range (GWT Elemental 2.8.2) - Sencha Documentation

The Range object represents a fragment of a document that can contain nodes ... Returns a number representing where in the startContainer the Range starts.

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查詢 「range startcontainer」的人也找了：

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