W3.JS 向 HTML 添加样式
添加 CSS 属性值
w3.addStyle(选择器,'属性','值')
通过 Id 添加样式
为 id 为 "London" 的元素添加红色背景颜色
通过标签添加样式
为所有 <h2> 元素添加红色背景颜色
通过类添加样式
为所有 class 为 "city" 的元素添加红色背景颜色
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