想获取符合规则的文件url却被报错？

[peacelvirene]

  loadFirstShowPic: function () {
var imgUrls = this.data.imgUrls;
var query = new AV.Query('_File');
query.startWith('name', '首页展示');
query.find().then(function (results) {
  results.map(function (result) {
    imgUrls.push(result.get('url'));
    console.log(result.get('url'));
  })
})
this.setData({ imgUrls: imgUrls });
  },
  onReady: function() {
    this.loadFirstShowPic();
  }

如上的代码，我想获取所有符合规定的文件的url，但是，微信小程序却提醒一下错误：

    WAService.js:1 thirdScriptError
query.startWith is not a function;at "pages/show/index/index" page loadFirstShowPic function
TypeError: query.startWith is not a function
    at e.loadFirstShowPic (http://804348251.appservice.open.weixin.qq.com/pages/show/index/index.js:44:11)
    at e.<anonymous> (http://804348251.appservice.open.weixin.qq.com/WAService.js:3:29333)
    at e.onReady (http://804348251.appservice.open.weixin.qq.com/pages/show/index/index.js:54:10)
    at e.<anonymous> (http://804348251.appservice.open.weixin.qq.com/WAService.js:3:28856)
    at A (http://804348251.appservice.open.weixin.qq.com/WAService.js:3:21142)
    at .<anonymous> (http://804348251.appservice.open.weixin.qq.com/WAService.js:3:22477)
    at http://804348251.appservice.open.weixin.qq.com/WAService.js:3:26239
    at http://804348251.appservice.open.weixin.qq.com/WAService.js:1:26737
    at Object.e.(anonymous function) [as PAGE_EVENT] (http://804348251.appservice.open.weixin.qq.com/WAService.js:2:4086)
    at n.<anonymous> (http://804348251.appservice.open.weixin.qq.com/asdebug.js:1:12936)

这是为什么？

[dennis]

startsWith 吧，主要看 api 文档。

[peacelvirene]

额，，尴尬，，是我看错了，，谢谢。。
另，所谓的api基本上是这个么？
https://leancloud.cn/docs/leanstorage_guide-js.html#多个查询条件
貌似这个API不是很好用的样子呢，，

[dennis]

我们提供了 api 文档，请多探索下文档首页

https://leancloud.github.io/javascript-sdk/docs/

[peacelvirene]

原来如此。。。

[peacelvirene]

但是，如下的代码中

    loadFirstShowPic: function () {
    var _imgUrls = this.data.imgUrls;
    _imgUrls = [];
    var query = new AV.Query('_File');
    query.startsWith('name', '首页展示');
    query.find().then(function (results) {
      results.map(function (result) {
        _imgUrls.push(result.get('url'));
        console.log(result.get('url'));
      })
    })
    this.setData({ imgUrls: _imgUrls });
  },
  onLoad: function() {
    console.log('onLoad');
    this.loadFirstShowPic();
  }

_imgUrls = [];这个起作用了，但是_imgUrls.push(result.get('url'));却未起作用，这是为什么？是`get('url')用错了吗？

[leeyeh]

new AV.Query('_File') -> new AV.Query(AV.File)

[peacelvirene]

我最后是这样来做的：
在onLoad的时候，

    loadFirstShowPic: function () {
    var _this = this;
    var query = new AV.Query('_File');
    query.startsWith('name', '首页展示')
    .select(['url','name'])
    .find()
    .then(function (results) {
      _this.setData({FirstShowPics: results});
    })
  },
  onLoad: function() {
    this.loadFirstShowPic();
  }

也就是说，用一个变量FirstShowPics直接将返回的array存储下来，然后在使用的时候是这样的

<block wx:for="{{FirstShowPics}}">
          <swiper-item class=".swiper-item">
            <image src="{{item.url}}" class="slide-image"></image>
          </swiper-item>
        </block>

[peacelvirene]

其实，之前在console.log里已经将正确的url打印出来了，