动态赋值

 <el-aside width="210px" class="left" :style="{height: height}">

main:

 computed: {
    height() {
      return `${document.documentElement.clientHeight - 120}px`;
    },
    userData() {
      return this.$store.state.config;
    },
    MenuStatus() {
      return this.$store.state.MenuStatus;
    },
  }