AngularJs ng-repeat解决循环对象出现重复项报错的问题
问题：ng- 的循环对象是不能出现重复项的，所以如果有重复的就会报错，应该是 key value的问题吧，不是很了解内部运行机制；经过查询发现 在 循环后面加上track by $index 就会解决问题，也就可以有重复对象了
报错：
划重点
解决办法：加上track by $index
<ul><li ng-repeat="x in names track by $index">{{x}}.{{lastname}}<button ng-click="delPerson($index)">删除button>li>ul>
DOCTYPE html>
<html><head><meta charset="utf-8"><script src="https://cdn.staticfile.org/angular.js/1.4.6/angular.min.js">script>
head><body><div ng-controller="myContrl"><h1>{{lastname}}家族成员：h1><ul><li ng-repeat="x in names track by $index">{{x}}.{{lastname}}<button ng-click="delPerson($index)">删除button>li>ul><p>添加成员：<input type="text" ng-model="name" placeholder="请输入需要添加的成员名字">p><button ng-click="addPerson(name)">确认添加button>div><script>angular.module('myapp', []).controller('myContrl', function ($scope, $rootScope) {// $rootScope 根作用域，在素有的控制器中都可以用
$scope.name = '';$scope.names = ["name1", "name2", "name3", "name4", "name4"];$scope.sayHellow = function () {$scope.greeting = "Hello," + $scope.name + "!";}$scope.delPerson = function (index) {// 将点击删除的对象从数组中移除，angular会自动更新列表
$scope.names.splice(index, 1);}$scope.addPerson = function (name) {// 输入的对象添加到数组，angular会自动更新列表
$scope.names.push(name);}$rootScope.lastname = "Refsnes";});//手动初始化
angular.bootstrap(document, ['myapp']);script>body>html> 
