1.這是我寫的專案用到的程式碼

<template>             
                    <textarea
                    ref="letters"
                    @click="copyToClipboard('letters')"
                    readonly="readonly"
                    autocomplete="off"
                    maxlength="99999"
                    class
 
="el-textarea__inner"
                    style="resize: none; min-height: 75px; height: 75px;"
                  >
                      https://spl438.wx.lppoll.com/act?act=27944
                  </textarea>
</template>

data() {
      return {
        loading: false
      }
    },

methods:{
  
 
//複製內容到貼上板
      copyToClipboard(elemRef) {
        let target;
        let succeed = false;
        if(this.$refs[elemRef]){
          target = this.$refs[elemRef];
          // 選擇內容
          let currentFocus = document.activeElement;
          target.focus();
          target.setSelectionRange(0, target.value.length);
          
 
// 複製內容
          try {
            succeed = document.execCommand("copy");
            alert("內容複製成功");
          } catch (e) {
            succeed = false;
          }
          // 恢復焦點
          if (currentFocus && typeof currentFocus.focus === "function") {
            currentFocus.focus();
          }
        }
        return succeed;
      }
}

這是參考文件

<template>
  <div>
    <textarea ref="letters"></textarea>
    <button @click="copyToClipboard('letters')">複製</button>
  </div>
</template>
<script>
  export default {
    data() {
      return {
        loading: false
      }
    },
    created() {
      this.$nextTick(function () {
        this.$refs.letters.value = '使用者名稱：張三\n性別：男\n電話號碼：15812322222';
      })
    },
    methods: {
      //複製內容到貼上板
      copyToClipboard(elemRef) {
        let target;
        let succeed = false;
        if(this.$refs[elemRef]){
          target = this.$refs[elemRef];
          // 選擇內容
          let currentFocus = document.activeElement;
          target.focus();
          target.setSelectionRange(0, target.value.length);
          // 複製內容
          try {
            succeed = document.execCommand("copy");
            alert("內容複製成功");
          } catch (e) {
            succeed = false;
          }
          // 恢復焦點
          if (currentFocus && typeof currentFocus.focus === "function") {
            currentFocus.focus();
          }
        }
        return succeed;
      },
    }
  }
</script>

參考文件地址：https://www.cnblogs.com/yeqrblog/p/9571129.html