angular select default value setting method

As shown below:

<select ng-model="selected" ng-options=" as  for x in users"></select>

$ = [
    {name:'a',id:'1'},
    {name:'b',id:'2'},
    {name:'c',id:'3'}
  ];
  $='2';//The value of id, distinguishing between types  $=$[0].id;//If you want the first value

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