作用:用来快速搭建页面基本结构
<el-container>:最外层容器标签
<el-header>:头部容器标签
<el-aside>:侧面容器标签
<el-main>:主要内容容器标签
<el-footer>:底部容器标签
注：以上标签采用的是flex弹性盒布局，本人还是比较喜欢用的(不会的可以去搜索相关教程，还是比较实用的)
常见的页面布局：
1.header+main
<el-container>
<el-header></el-header>
<el-main></el-main>
</container>
2.heaer+main+footer
<el-container>
<el-header></el-header>
<el-main></el-main>
<el-footer></el-footer>
</container>
3.aside+main
<el-container>
<el-aside></el-aside>
<el-main></el-main>
</container>
4.header+aside+main
<el-container>
<el-header></el-header>
<el-container>
<el-aside></el-aside>
<el-main></el-main>
</el-container>
</container>
5.header+aside+main+footer
<el-container>
<el-header></el-header>
<el-container>
<el-aside></el-aside>
<el-main></el-main>
<el-footer></el-footer>
</el-container>
</container>
6. aside+header+main
<el-container>
<el-aside></el-aside>
<el-container>
<el-header></el-header>
<el-main></el-main>
</el-container>
</container>
7.aside+header+main+footer
<el-container>
<el-aside></el-aside>
<el-container>
<el-header></el-header>
<el-main></el-main>
<el-footer></el-footer>
</el-container>
</container>
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原文链接：https://blog.csdn.net/qq_51481048/article/details/122874921