vue自定义模态框组件，父级引入

<template>
    <ModalBox :visible.sync="modalShow">
      <div style="height: 800px">自定义模态框</div>
      <div class="modal-title" slot="title">
        <el-page-header
          content="自定义组件"
          @back="modalShow = false"
        ></el-page-header>
        <el-button type="primary">确定</el-button>
        <el-button>取消</el-button>
      </div>
    </ModalBox>
</template>

<script>
import ModalBox from "../components/modalBox/index";
export default {
  name: "name",
  components: { ModalBox },
  data(){
      return{
          modalShow: true,
        }
  }
}
</script>
<style scoped>
::v-deep .el-table__header {
  position: sticky;
  top: 0;
}
</style>

定义的组件

<template>
  <transition name="el-zoom-in-center" v-if="modalShow">
    <div class="modal">
      <slot name="title"></slot>
      <div class="modal-body">
        <slot></slot>
      </div>
    </div>
  </transition>
</template>
export default {
  name: "index",
  props: {
    visible: { type: Boolean, default: "" },
  }
};
</script>
<style scoped>
.modal {
  position: absolute;
  left: 16px;
  top: 16px;
  bottom: 16px;
  background: #fff;
  z-index: 99;
  width: calc(100% - 32px);
  height: calc(100% - 32px);
  overflow-y: auto;
  overflow-x: hidden;
  border: 1px solid #c6c6c6;
  border-radius: 4px;
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.2);
}
.modal ::v-deep .modal-title {
  padding: 16px;
  background: #f0f2f5;
  display: flex;
  align-items: center;
  border-bottom: 1px solid #c6c6c6;
  height: 36px;
}
.modal ::v-deep .modal-title .el-page-header {
  flex: 1;
}
.modal .modal-body {
  margin: 16px;
  /* 32是margin，69是modal-title的高度 */
  height: calc(100% - 32px - 69px);
  overflow-y: auto;
  overflow-x: hidden;
}
</style>

效果展示