bootstrap.js是bootstrap的所有js指令的集合，其作用就是供开发的时候进行调试用，其使用方法是找到dist文件夹里面的css和JS文件，将带有min的拷贝到你项目中对应的css和JS文件夹里面即可。
推荐：《bootstrap教程》
bootstrap.js的作用
bootstrap.js 这个是bootstrap的灵魂所在，是bootstrap的所有js指令的集合，你看到bootstrap里面所有的js效果，都是由这个文件控制的，这个文件也是一个未经压缩的版本，供开发的时候进行调试用
获取bootstrap.js文件
去bootstrap官方网站上下载源码，也可以使用相关的CND来创建，具体方法是：下载bootstrap，找到dist文件夹里面的css和JS文件，将带有min的拷贝到你项目中对应的css和JS文件夹里面。
在前端页面head标签里面引入css文件：
<link rel="stylesheet" href="/css/bootstrap.min.css" >
在页面
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