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我正在学习 Polymer 1.8，并且正在尝试从 api 获取数据。之后，我想将我的 ontap() 函数中的数据与 dom-repeate 绑定，但我在控制台中遇到了一个奇怪的错误：[dom-repeat::dom-repeat]: expected array for items, found [{" requestnum":"1045","orgid":"EAGLENA"},{"requestnum":"1046","orgid":"EAGLENA"},{"requestnum":"1047","orgid":"EAGLENA" },{"requestnum":"1048","orgid":"EAGLENA"},{"requestnum":"1049","orgid":"EAGLENA"}]

我无法解决这个问题，任何人都可以帮助我吗？这段代码有什么问题？？？
我使用聚合物 1.8

*这是我的 html 文件 maximo-test-card.html：

    <dom-module id="maximo-test-card">  
      <template>

            <template is="dom-repeat" items="{{hi}}">
                <li>
                    <span>{{item.requestnum}}</span>

                </li>
            </template>


    <div>{{hi}}</div>

            <iron-ajax
            id="requestRepos"
            headers='{"Content-Type": "application/json", "Accept": "someAccept", "Authorization": "someAuthorizationToken"}'
            url="http://vaganet.vaganet.fr:9080/maximo/oslc/os/mxinvres?oslc.select=*" 

            handle-as="json"
            on-response="ontap"> </iron-ajax> </template>
     <script src="maximo-test-card.js"></script>

    </dom-module>

*this is my js file maximo-test-card.js:  
    Polymer({
        is: 'maximo-test-card',


        properties: {
            repos: {
                type: Array
            },
            githubrepository:{
              type: Array
            },

            hi:{
                type: Array,

            },


        },

        ready: function () {
    this.$.requestRepos.generateRequest();
            //console.log(hi)
            //this.name=hi
        },

        ontap: function (data) {
            this.repos = data.detail.response.member;

            hi = []
            for (var i = 0; i < 5; i++) {
                hi[i] = {"requestnum":this.repos[i].requestnum,"orgid":this.repos[i].orgid}
            }
            this.hi = JSON.stringify(hi)
            alert(this.hi);
            return this.hi;

          },

    });
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