vue复制textarea文本域内容

<template>
  <div>
    <textarea ref="letters"></textarea>
    <button @click="copyToClipboard(‘letters‘)">复制</button>
  </div>
</template>
<script>
  export default {
    data() {
      return {
        loading: false
      }
    },
    created() {
      this.$nextTick(function () {
        this.$refs.letters.value = ‘用户名：张三\n性别：男\n电话号码：15812322222‘;
      })
    },
    methods: {
      //复制内容到粘贴板
      copyToClipboard(elemRef) {
        let target;
        let succeed = false;
        if(this.$refs[elemRef]){
          target = this.$refs[elemRef];
          // 选择内容
          let currentFocus = document.activeElement;
          target.focus();
          target.setSelectionRange(0, target.value.length);
          // 复制内容
          try {
            succeed = document.execCommand("copy");
            alert("内容复制成功");
          } catch (e) {
            succeed = false;
          }
          // 恢复焦点
          if (currentFocus && typeof currentFocus.focus === "function") {
            currentFocus.focus();
          }
        }
        return succeed;
      },
    }
  }
</script>