网页内容背景黑白切换代码
原生js css3制作一个简单的网页文字内容背景色黑白切换效果，设置div容器，点击按钮切换黑白背景色背景色效果。(Native js css3 makes a simple black and white background color switching effect of web text content, set the div container, click the button to switch the black and white background color background color effect.)
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