怎样动态更改style,即如:<span id="CID" class="c1"></span>要用js更改

怎样动态更改style,即如:

1<span class="c1" id="CID"></span>

要用js更改为c2。我用CID.style、CID.class都不行。
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CID.className = "c2"
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CID.className = "c2";

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