注释很详细，直接上代码

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当传输内容只有一种时的基础写法

源码

App.vue

<template>
  <div id="app">
    <h1>被淡化的背景内容</h1>
    <my-dialog>
      <!-- 插槽内容:文字以及dom结构都可以传 -->
      <span>你确认要删除吗？</span>
      <span>--代码对我眨眼睛</span>
    </my-dialog>
  </div>
</template>
<script>
import MyDialog from "./components/MyDialog.vue";
export default {
  name: "App",
  components: {
    MyDialog,
  },
  data() {
    return {
    };
  },
  methods: {
  }
};
</script>
<style lang="less">

</style>

MyDialog.vue

<template>
  <div class="MyDialogBack">
    <div class="MyDialog">
        <div class="MyDialogTop">
            <span>友情提示</span>
            <span>×</span>
        </div>
        <div class="MyDialogContent">
            <!-- 插槽接收内容 -->
            <slot></slot>
        </div>
        <div class="MyDialogButton">
            <button>确定</button>
            <button>取消</button>
        </div>
    </div>
  </div>
</template>

<script>
export default {};
</script>

<style lang="less" scoped>
*{
    margin: 0;
    padding: 0;
}
.MyDialogBack{
    position: absolute;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background-color:rgba(128, 128, 128,0.9);
}
.MyDialog{
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%,-50%);
    background-color: #ffffff;
    width: 600px;
    height: 300px;
    border-radius: 10px;
}
.MyDialogTop{
    margin: 20px 20px;
    display: flex;
    justify-content: space-between;
    padding-bottom: 20px;
    border-bottom: #a7a7a7 1px solid;
}
.MyDialogTop span:nth-child(1){
    font-size: 25px;
    font-weight: bold;
}
.MyDialogTop span:nth-child(2){
    font-size: 40px;
    font-weight: bold;
    margin-top: -10px;
    color: #a7a7a7;
}
.MyDialogContent{
    margin: 20px 25px;
    margin-bottom: 10px;
    font-size: 20px;
    height: 140px;
}
.MyDialogButton{
    display: flex;
    justify-content: end;
}
.MyDialogButton button{
    width: 50px;
    height: 30px;
    margin-right: 20px;
    border-radius: 3px;
    border: #a7a7a7 1px solid;
}
.MyDialogButton button:nth-child(1){
    background-color: #0079bc;
    color: #fffeff;
}
.MyDialogButton button:nth-child(2){
    background-color: #fffeff;
}
</style>

效果演示