<!DOCTYPE html>
<html>
<script src="http://ajax.googleapis.com/ajax/libs/angularjs/1.4.8/angular.min.js"></script>
<link rel="stylesheet" href="http://www.w3schools.com/lib/w3.css">
<body>
<script>
var app = angular.module("myShoppingList", []);
app.controller("myCtrl", function($scope) {
$scope.products = ["Milk", "Bread", "Cheese"];
$scope.addItem = function () {
$scope.errortext = "";
if (!$scope.addMe) {return;}
$scope.products.push($scope.addMe);
}
$scope.removeItem = function (x) {
$scope.errortext = "";
$scope.products.splice(x, 1);
}
});
</script>
<div ng-app="myShoppingList" ng-cloak ng-controller="myCtrl" class="w3-card-2 w3-margin" style="max-width:400px;">
<header class="w3-container w3-light-grey w3-padding-16">
<h3>My Shopping List</h3>
</header>
<ul class="w3-ul">
<li ng-repeat="x in products" class="w3-padding-16">{{x}}<span ng-click="removeItem($index)" style="cursor:pointer;" class="w3-right w3-margin-right">×</span></li>
</ul>
<div class="w3-container w3-light-grey w3-padding-16">
<div class="w3-row w3-margin-top">
<div class="w3-col s10">
<input placeholder="Add shopping items here" ng-model="addMe" class="w3-input w3-border w3-padding">
</div>
<div class="w3-col s2">
<button ng-click="addItem()" class="w3-btn w3-padding w3-green">Add</button>
</div>
</div>
<p class="w3-padding-left w3-text-red">{{errortext}}</p>
</div>
</div>
</body>
</html>
我在 w3schools 中看到了这段代码，我的问题是，如果我尝试添加已在列表中的产品，但我想添加已在列表中的相同产品，则产品不会添加到列表或数组
最佳答案
这些值肯定会被插入数组，但是 ng-repeat 不允许重复，因此，您看不到 dom 的变化，请使用 track by $index 来允许重复
ng-repeat="x in products track by $index"
关于javascript - 将相同的项目添加到数组中，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/38694125/