JS弹出窗——三种

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alert();弹出内容框(警告框)

![](https://upload-images.jianshu.io/upload_images/24142585-2585e959cfe0bc93.png?imageMogr2/auto-orient/strip%7CimageView2/2/w/1240)

confirm();确认消息框

![](https://upload-images.jianshu.io/upload_images/24142585-393e5887d150395d.png?imageMogr2/auto-orient/strip%7CimageView2/2/w/1240)

prompt();消息提示框

![](https://upload-images.jianshu.io/upload_images/24142585-543787c885ea50c0.png?imageMogr2/auto-orient/strip%7CimageView2/2/w/1240)

注意事项:

1:当弹出弹出框时,网页暂停到当前行为。

2:alert()是没有任何返回值的,

confirm()的返回值是Boolean,点击确定就是true,点击取消就是false,

prompt()的返回值是一个字符串

![](https://upload-images.jianshu.io/upload_images/24142585-51d82775177f8c0b.gif?imageMogr2/auto-orient/strip)
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