爲什麼我們需要在ng-option中配對是Angular的選擇。雖然我們可以使工作完成

Question

嗨，任何人都可以告訴我爲什麼我們需要使「（k，v）」在

ng-options =「k as v for（k，v）in types」因爲我們可以做的工作是通過編寫 ng-options =「k as v for v in types」來完成。

<div ng-app="myApp" ng-controller="myCtrl"> 

    <p>Select a car:</p> 

<select ng-model="selectedCar" ng-options="y.brand for (x, y) in cars"> 
    </select> 

<h1>You selected: {{selectedCar.brand}}</h1> 
<h2>Model: {{selectedCar.model}}</h2> 
<h3>Color: {{selectedCar.color}}</h3> 

<p>The visible text inside the dropdown list can also be a property of the value object.</p> 

</div> 

<script> 
    var app = angular.module('myApp', []); 
    app.controller('myCtrl', function($scope) { 
     $scope.cars = { 
      car01 : {brand : "Ford", model : "Mustang", color : "red"}, 
      car02 : {brand : "Fiat", model : "500", color : "white"}, 
      car03 : {brand : "Volvo", model : "XC90", color : "black"} 
     } 
    }); 

Answer 1

例子

ng-options="Single.Value as Single.Caption for Single in $ctrl.Example.Singles" 


ng-repeat="(indexSingle, Single) in ($ctrl.Example.Singles | filter:{IsVisible:true})" 


ng-repeat="Single in $ctrl.Example.Singles" 

你是好奇中間的一個位置是它在一個例子：

<div ng-repeat="(indexSingle, Single) in ($ctrl.Example.Singles | filter:{IsVisible:true})"> 
    Index = {{indexSingle}} 
<div>