AngularJs ng-repeat重复项异常解决方案

ng-repeat="v in arr track by $index"

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8" />
    <title>Document</title>
</head>
<body ng-app="myApp">
    <!--
        ng-init:初始化数据
        ng-init="person={name:‘小明‘}"
     -->
    <div ng-app="myApp" ng-controller="myController">
        <input type="text" ng-model="iptValue">
        <input type="button" ng-click="clickFn()" value="按钮">
        <ul>
            <li ng-repeat="v in arr track by $index">{{v}}</li>
        </ul>
    </div>

</body>
<script type="text/javascript" src="angular.min.js"></script>
<script type="text/javascript">
// [] ---> 依赖
var app = angular.module("myApp",[]);
// $scope作用域：作用域范围myController
app.controller("myController",function($scope){
    $scope.arr = ["111","222"];
    $scope.clickFn = function(){
        var v = $scope.iptValue;
        $scope.arr.push(v);
        $scope.iptValue = "";
    }
});
</script>
</html>

1.现象

[html] view plain copy

print?

1. <ul ng-app="myApp" ng-controller="myCtrl">
2. <li ng-repeat="x in items">
3. <strong>{{x}}</strong>
4. </li>
5. </ul>
6. <script>
7. //使用ng-repeat 重复 html代码
8. var app = angular.module(‘myApp‘, []);
9. app.controller(‘myCtrl‘, function ($scope) {
10. $scope.items = [1, 2, 3, 2];
11. });
12. </script>

当数组中有重复项时，抛出异常

点击异常链接，没有看到异常

2.解决方法

默认在ng-repeat的时候每一个item都要保证是唯一的，否则console就会打出error告诉你哪个key/value是重复的。

指定跟踪值唯一可以了

[html] view plain copy

print?

1. <ul ng-app="myApp" ng-controller="myCtrl">
2. <li ng-repeat="x in items track by $index">
3. <strong>{{x}}</strong>
4. </li>
5. </ul>
6. <script>
7. //使用ng-repeat 重复 html代码
8. var app = angular.module(‘myApp‘, []);
9. app.controller(‘myCtrl‘, function ($scope) {
10. $scope.items = [1, 2, 3, 2];
11. });
12. </script>