html：

<el-button @click="copy(row)">复制</el-button>

<!-- 复制弹框 -->
<el-dialog :close-on-click-modal="false" title="复制" width="600px" 
    :visible.sync="copyVisible" append-to-body>
  <el-form ref="formData" :model="formData" :rules="rules"
    label-width="100px" v-loading="copyLoading">
    <el-form-item label="活动名称: " prop="title">
      <el-input v-model="formData.title" type="text" placeholder="请输入活动名称" />
    </el-form-item>
    <el-form-item>
      <el-button type="primary" @click="copyTableData">提交</el-button>
    </el-form-item>
  </el-form>
</el-dialog>

js变量：

data () {
    return {
       // 复制弹框显示和隐藏
       copyVisible: false,
       // 复制loading
       copyLoading: false,
       // 表单数据
       formData: {
         id: "",
         title: "",
       },
       rules: {
         title: [ { required: true, message: '请输入活动名称', trigger: 'blur', } ]
       }
    }
},

js方法：

/**
 * 复制弹框显示
 */
copy(row) {
  Object.keys(this.formData).forEach(key => {
    this.formData[key] = row[key];
  });
  this.copyVisible = true;
},
/**
 * 复制数据
 */
copyTableData() {
  this.$refs['formData'].validate(async valid => {
    if (valid) {
      this.$confirm("确定复制？", "提示", { type: "warning" })
        .then(async () => {
          this.copyLoading = true;
          let params =  { ...this.formData };
          let res = await activityInfo.copy(params);
          try {
            if (res.code == 200) {
              this.copyLoading = false;
              this.copyVisible = false;
              this.$message.success(`复制成功`);
              this.listQuery.page = 1;
              this.getList();
            } else {
              this.copyLoading = false;
              this.$message.error(`复制失败`);
            };
          } catch (error) {
            this.copyLoading = false;
          };
        });
    } else {
      return false;
    };
  });
}

效果图：