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並前往https://www.typescriptlang.org/docs/handbook/dom-manipulation.html

Documentation - DOM Manipulation - TypeScript

getElementById (elementId: string): HTMLElement | null;. Pass it an element id string and it will return either HTMLElement or null . This method introduces one ...

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查詢 「getElementById class」的人也找了：

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  3. getElementsByTagName
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  6. querySelector
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  7. getElementsByClassName forEach
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  8. getElementsByClassName value
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