ng-table插件（二-惰性加载数组）

AngularJS ng-table插件第二讲，下面这个官网例子会根据ng-option来调用map来改变内部数据，然后整个ng-table也会改变。
下面是源码，我会根据源码来讲解

<div ng-app="myApp">
  <div ng-controller="demoController as demo">
    <h2 class="page-header">Lazy loading managed array</h2>
    <div class="bs-callout bs-callout-info">
      <h4>Overview</h4>
      <p>You are not limited to having the data array to hand at the time when <code>NgTableParams</code> is created. So for example you could load the data using <code>$http</code> and then hand this to <code>NgTableParams</code></p>
    </div>
    <div class="form-inline" style="margin-bottom: 20px">
      <div class="form-group">
        <label for="datasets">Select dataset</label>
        <select id="datasets" class="form-control" ng-model="demo.dataset" ng-options="dataset for ds in demo.datasets"
                ng-change="demo.changeDs()"></select>
      </div>
    </div>
    <table ng-table="demo.tableParams" class="table table-condensed table-bordered table-striped">
      <tr ng-repeat="row in $data">
        <td data-title="'Name'" filter="{name: 'text'}" sortable="'name'">{{row.name}}</td>
        <td data-title="'Age'" filter="{age: 'number'}" sortable="'age'">{{row.age}}</td>
        <td data-title="'Money'" filter="{money: 'number'}" sortable="'money'">{{row.money}}</td>
      </tr>
    </table>
  </div>
</div>

• 使用<code>controller as demo</code>来把<code>controller</code>内的对象绑定在<code>controller </code>的实例对象上。可以跨越<code>scope</code>调用，进行双向绑定。
• 当<code>ng-option</code>发生变化的时候，会触发<code>ng-change</code>，<code>ng-change</code>会把值传进到<code>changeDs()</code>中。
• <code>$data</code>是ng-table内部数据源，<code>row in $data</code> ng-table会遍历展示数据源。
• <code>filter="{name: 'text'}" </code> filter属性会规定过滤条件。

(function() {
  "use strict";
  var app = angular.module("myApp", ["ngTable", "ngTableDemos"]);
  app.controller("demoController", demoController);
  demoController.$inject = ["NgTableParams", "ngTableSimpleList"];
  function demoController(NgTableParams, simpleList) {
    var self = this;
    self.changeDs = changeDs;//因为已经用controller as demo，相当于实例化controller，直接通过this可以调用
    self.datasets = ["1", "2"];//ng-options的值
    self.dataset1 = simpleList;//simpleList相当于ngTableSimpleList注入的数据源。与createDs2想对应（当ng-option为1的时候）。
    self.dataset2 = createDs2();//与createDs2想对应，与ng-option=2对应与。
    self.tableParams = new NgTableParams();//实例化table插件
    function changeDs() {//当ng-change时候调用
      self.tableParams.settings({
        dataset: self["dataset" + self.dataset]；//确定调用dataset1还是dataset2
      });
    }
    function createDs2() {//这里就是通过map改变数据
      return simpleList.map(function(item) {
        return angular.extend({}, item, {
          age: item.age + 100
        });
      });
    }
  }
})();
(function() {
  "use strict";
  angular.module("myApp").run(configureDefaults);
  configureDefaults.$inject = ["ngTableDefaults"];
  function configureDefaults(ngTableDefaults) {//这里可以看出源码是根据provider实现的
      ngTableDefaults.params.count = 5;
      ngTableDefaults.settings.counts = [];
  }
})();