布局不能占满整个屏幕

上图

 上下左右有缝，布局占不满全屏

解决方法：

在App.vue中加一句css样式即可

body {
  margin: 0;
  padding: 0;
}

全局效果

本效果基于element ui

安装

npm i element-ui -S

在main.js中引入

import ElementUI from 'element-ui';
import 'element-ui/lib/theme-chalk/index.css';
Vue.use(ElementUI);

 样式代码

<template>
  <div class="container">
    <el-container>
      <el-aside width="200px">
        <el-menu
          default-active="1"
          class="el-menu-vertical-demo"
          @open="handleOpen"
          @close="handleClose"
          background-color="#545c64"
          text-color="#fff"
          active-text-color="#ffd04b"
        >
        <el-menu-item index="1">
            <i class="el-icon-menu"></i>
            <span slot="title">导航一</span>
          </el-menu-item>
          <el-submenu index="2">
            <template slot="title">
              <i class="el-icon-location"></i>
              <span>导航二</span>
            </template>
            <el-menu-item-group>
              <template slot="title">分组一</template>
              <el-menu-item index="2-1">选项1</el-menu-item>
              <el-menu-item index="2-2">选项2</el-menu-item>
            </el-menu-item-group>
            <el-menu-item-group title="分组2">
              <el-menu-item index="1-3">选项3</el-menu-item>
            </el-menu-item-group>
            <el-submenu index="1-4">
              <template slot="title">选项4</template>
              <el-menu-item index="1-4-1">选项1</el-menu-item>
            </el-submenu>
          </el-submenu>
          
          <el-menu-item index="3">
            <i class="el-icon-document"></i>
            <span slot="title">导航三</span>
          </el-menu-item>
          <el-menu-item index="4">
            <i class="el-icon-setting"></i>
            <span slot="title">导航四</span>
          </el-menu-item>
        </el-menu>
      </el-aside>
      <el-container>
        <el-header>
          Header    
        </el-header>
        <el-main>
          Main
        </el-main>
      </el-container>
    </el-container>
  </div>
</template>

<script>
export default {
  data() {
    return {};
  },
  methods: {
    handleOpen(key, keyPath) {
      //导航菜单
      console.log(key, keyPath);
    },
    handleClose(key, keyPath) {
      //导航菜单
      console.log(key, keyPath);
    },
  },
  components: {},
};
</script>

<style scoped lang="">
.el-header,
.el-footer {
  background-color: #b3c0d1;
  color: #333;
}

.el-aside {
  background-color: #d3dce6;
  color: #333;
  height: 100vh;
}

.el-main {
  background-color: #e9eef3;
  color: #333;
}

body > .el-container {
  margin-bottom: 40px;
}

.el-container:nth-child(5) .el-aside,
.el-container:nth-child(6) .el-aside {
  line-height: 260px;
}

.el-container:nth-child(7) .el-aside {
  line-height: 320px;
}

.el-menu {
  height: 100%;
  text-align: left;
}
</style>

注意:

lang=' '空出，请根据自己实际使用的预编译器种类补全。