When I click on the button I want the text to show up at the top of the webpage, in a red banner. I have looked on google and youtube and can't find a solution anywhere.If anyone could take a look a my code to see how I could make this work please!When I click on the button I want the text to s
阅读背景：
非模态功能，警报出现在页面顶部的红色横幅中
来源：互联网
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