Polymer 为什么'；我的这个.\u setPropertyName函数工作吗？

我有以下聚合物元素：

<link rel="import" href="../../bower_components/polymer/polymer.html">
<link rel="import" href="../../bower_components/polymer/polymer-element.html">
<link rel="import" href="../shared-styles.html">
<link rel="import" href="../../bower_components/dfw-styles/dfw-styles.html">
<link rel="import" href="../../bower_components/paper-button/paper-button.html">
<link rel="import" href="../../bower_components/paper-menu-button/paper-menu-button.html">
<link rel="import" href="../../bower_components/paper-listbox/paper-listbox.html">

<dom-module id="baseline-policy-create">
  <template>
    <style include="dfw-styles">
      :host {
        display: block;
      }
      .top-button{
        float : right;
      }
    </style>

    <div class="outer-buttons">
      <paper-menu-button horizontal-align="right" no-overlap="true" no-animations class="top-button">
        <paper-button slot="dropdown-trigger" class="dropdown-trigger create-button btn-primary">
          <iron-icon icon="menu"></iron-icon>
          <span>Create Baseline Policy</span>
        </paper-button>
        <paper-listbox slot="dropdown-content" class="dropdown-content">
          <template is="dom-repeat" items="{{_domains}}">
            <paper-item on-tap="getDomainSchema">[[item.label]]</paper-item>
          </template>
        </paper-listbox>
      </paper-menu-button>
    </div>
  </template>
  <script>
    class BaselinePolicyCreate extends Polymer.Element {
      static get is() {
        return 'baseline-policy-create';
      }

      static get properties() {
        return {
          _domains: {
            type: Array,
            value: [{'name':'Package', 'label':'Package'},
                    {'name':'Subscription', 'label':'Subscription'}] //TODO: is it possible to get these values from an API source
          },
          requestedDomain: {
            type: String,
            value : "",
            notify : true,
            readOnly : true
          }
        }
      }

      getDomainSchema(evt) {
        console.info("Get the schema for the following domain:", evt.target.innerText);
        console.log(this.requestedDomain);
        this._setRequestedDomain(evt.target.innerText);
        //this.requestedDomain = evt.target.innerText;
        console.log(this.requestedDomain);
      }
    }
    customElements.define(BaselinePolicyCreate.is, BaselinePolicyCreate);
  </script>
</dom-module>

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但要做到这一点，我不能将readOnly标志设置为true。如果我使用这个.\u setRequestedDomain，我会收到一个错误，说它不是一个函数。我是否在顶部遗漏了一些使其工作的导入，或者它在Polymer 2中被删除了？

我一直在测试您的代码，没有问题

You only will get the error "this.setRequestedDomain is not a function" if your property is set as readOnly = false.

Please, try again and tell me if its ok.

---

我无法复制这个问题：@tony19是的，它现在对我有效。我做了一些代码清理，所以可能是什么导致了问题。谢谢奇怪的是，我又试了一次，现在可以用了。可能是导入冲突或导致导入失败的原因。谢谢

You only will get the error "this.setRequestedDomain is not a function" if your property is set as readOnly = false.

Please, try again and tell me if its ok.