页面分成header，main，footer

在header里面最外层加样式：

padding-top: constant(safe-area-inset-top);
padding-top: env(safe-area-inset-top);

在main内容部分要加上

.main {
  padding-top: constant(safe-area-inset-top);
  padding-top: env(safe-area-inset-top);
  padding-bottom: constant(safe-area-inset-bottom);
  padding-bottom: env(safe-area-inset-bottom);
}

在底部footer外层加上

 padding-bottom: constant(safe-area-inset-bottom);
 padding-bottom: env(safe-area-inset-bottom);

 整体代码如下：

<template>
  <div>
    <div class="preview_header">
      <div class="header">
        <p class="header_left" @click="clickGoBack">返回</p>
        <p class="header_title">标题</p>
        <p class="header_right" @click="clickMake">编辑</p>
      </div>
    </div>
    <div class="main">
      <div class="content">
        <p>内容</p>
      </div>
    </div>
    <div class="footer_con">
      <div class="footer">
        <div class="submit" @click.stop="clickSubmit">
          <p class="submit_btn">提交</p>
        </div>
      </div>
    </div>
  </div>
</template>

<script>

export default {
  name: "Index",
  data () {
    return {
    };
  },

  methods: {
    //左箭头返回
    clickGoBack () {
      this.$store.state.entry === this.$route.path ? this.$ZhiYue.closePage() : this.$router.back();
    },
    //点击右边按钮
    clickMake () { }
  }
}
</script>
<style scoped lang='scss'>
* {
  margin: 0;
  padding: 0;
}
.preview_header {
  width: 100%;
  position: fixed;
  top: 0;
  background: #ffffff;
  z-index: 999;
  padding-top: constant(safe-area-inset-top);
  padding-top: env(safe-area-inset-top);
}
.header {
  width: 100%;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: solid 1px #eeeeee;
}
.header_left {
  margin-left: 16px;
  position: absolute;
  left: 0;
}
.header_title {
  width: 100%;
  font-size: 18px;
  font-family: PingFangSC, PingFangSC-Medium;
  font-weight: 500;
  text-align: center;
  color: #333333;
  text-align: center;
}
.header_right {
  font-size: 16px;
  font-family: PingFangSC, PingFangSC-Regular;
  font-weight: 400;
  text-align: center;
  color: #333333;
  margin-right: 16px;
  position: absolute;
  right: 0;
}
.main {
  padding-top: constant(safe-area-inset-top);
  padding-top: env(safe-area-inset-top);
  padding-bottom: constant(safe-area-inset-bottom);
  padding-bottom: env(safe-area-inset-bottom);
}
.content {
  margin-top: 44px;
  padding-bottom: 80px;
}
.footer_con {
  width: 100%;
  position: fixed;
  bottom: 0;
  z-index: 10;
  background: #ffffff;
  padding-bottom: constant(safe-area-inset-bottom);
  padding-bottom: env(safe-area-inset-bottom);
}
.footer {
  padding-top: 12px;
  padding-bottom: 12px;
}
.submit {
  height: 44px;
  background: linear-gradient(90deg, #50a3ff, #1283ff);
  border-radius: 4px;
  margin: 0 16px;
  text-align: center;
  line-height: 44px;
  p {
    font-size: 16px;
    font-family: PingFangSC, PingFangSC-Medium;
    font-weight: 500;
    color: #ffffff;
    text-align: center;
  }
}
</style>

也可以单独判断是否是iphoneX

   isPhoneX () {
      var u = navigator.userAgent;
      var isIOS = !!u.match(/\(i[^;]+;( U;)? CPU.+Mac OS X/); //ios终端
      if (isIOS) {
        if (screen.height == 812 && screen.width == 375) {
          console.log('是iphoneX')
        } else {
          console.log('不是iphoneX')
        }
      } else {
        console.log('是安卓')
      }
    }