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並前往https://stackabuse.com/how-to-change-elements-class-with-javascript-classname-and-classlist/

How to Change Element's Class with JavaScript - className ...

getElementById (id_name) - returns a single HTML element whose id is equal to id_name . getElementsByTagName( ...

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查詢 「getElementById class」的人也找了：

  1. getElementsByClassName
    2.
  2. getElementById
    3.
  3. getElementsByTagName
    4.
  4. document.getelementbyid value
    5.
  5. Element class
    6.
  6. querySelector
    7.
  7. getElementsByClassName forEach
    8.
  8. getElementsByClassName value
    9.