[Bootstrap] Bootstrap study notes

1, because the bootstrap uses html5 characteristics, in order, it is required in the very beginning plus <! DOCTYPE html>

2, Bootstrap need JQuery to work properly, you need to import jquery.min.js,

       It followed  Bootstrap of css, which defines various styles,

       Finally  Bootstrap the js, for generating interactive effects, such as turning off the warning box;

   PS: Note: The order no mistake, otherwise there are some effects will get out. First, JQuery, then the Bootstrap css, finally Bootstrap js

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