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並前往https://www.javatpoint.com/how-to-add-a-class-to-an-element-using-javascript

How to add a class to an element using JavaScript - javatpoint

Using .className property · <div id = "div1" class = "oldClass"> </div> · document.getElementById("div1").className = " newClass";.

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查詢 「getElementById class」的人也找了：

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