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iealert.js is a very useful IE browser version is too low to prompt the Jquery plug-in, although many websites have now abandoned support for IE6, but some users still use IE6 browser, in the case of no prompt, The layout of the website opened with IE6 will be concatenated, and users may not want to see it once, which will cause some users to lose. This Jquery plug-in just solves this problem. After applying this plug-in, by default, browsers lower than IE8 will pop up a prompt box. If you want to see the effect, use IE6 and IE7 to open and run (Google, Firefox, Sogou and other browsers use compatibility mode).