let str = '<a>[Cite]</a><br><br>12345<br><br>1234' js 判断字符串里面是否存在两个连续的<br><br>

根据引用\[3\]中的内容，我们可以使用正则表达式来判断字符串中是否存在两个连续的`<br><br>`。可以使用`/\<br\>\<br\>/`来匹配字符串中的两个连续的`<br><br>`。如果匹配成功，则说明字符串中存在两个连续的`<br><br>`。
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