mounted() {
    // 这样写的目的是为了只watch一次,因为网络原因导致value 的值没有实时同步过来.用mounted.watch代替created
    const unwatch = this.$watch('value', function (newValue, oldValue) {
      this.dynamicValue = newValue.split(",");
      unwatch();
    });
  },

参考链接:
https://www.jianshu.com/p/76e40253e84d
el-input输入框需要支持多输入
https://blog.csdn.net/m0_37755267/article/details/125768287