AngularJs入门

1 $scope（作用于一个Controller）与$rootScope（全局）的作用域区别

2 特殊变量名（如：$scope,$rootScope）在js压缩（类似Android的代码混淆）过程中避免被替换而报错的解决方案

原：app.controller('secondController',function ($scope,$rootScope) { $scope.name = '李四'; $rootScope.age = '30'; });
改：app.controller('firstController',['$scope',function ($s) {……}]);

3 无controller的数据进行绑定

3.1 方案1：app.run()

{{sex}}

var app = angular.module("myApp",[]);
    app.run(['$rootScope',function ($rootScope) {
        $rootScope.sex = '男';
    }]);

3.2 方案2:直接在其他controller中使用$rootScope

run方法初始化全局的数据，只对全局作用域起作用

var app = angular.module("myApp",[]);
    app.controller('secondController',function ($scope,$rootScope) {
        $scope.name = '李四';
        $rootScope.sex = '男';
    });

4 $scope中的$apply、$timeout、$watch方法

4.1 $apply

作用:通知界面（View）数据（Model）的变化(类似Android中列表控件的notifyDataChanged())

// 2s后“张三”变成“李四”
    var app = angular.module("myApp",[]);
    app.controller('firstController',function ($scope) {
        $scope.name = '张三';
        setTimeout(function () {
            $scope.$apply(function () {
                $scope.name = '李四';
            });
        },2000);
    });

4.2 timeout的另一种用法：

// 2s后“10”变成“20”
    app.controller('firstController',$timeout) {
        $scope.age = '10';
        $timeout(function () {
            $scope.age = '20';
        },2000);
    });

4.3 ng-click=”show();”的使用

声明：

$scope.show = function () {
        alert('李四');
        $scope.name = '点击后的李四';
    }

调用：

<div ng-controller="firstController" ng-click="show();"> {{name}} </div>

4.3 $watch

用于监听某个数值的变化（类似Android的TextWatcher）

//当总价>=100，运费为0；否则为￥10. <!DOCTYPE html> <html> <head> <Meta http-equiv="Content-Type" content="text/html; charset=utf-8"/> <title></title> <script type="text/javascript" src="../lib/angular.min.js"></script> </head> <body> <div ng-app="myApp"> <div ng-controller="CartController"> <p>价格:<input type="number" ng-model="iphone.money"></p> <p>个数:<input type="number" ng-model="iphone.num"></p> <p>费用:<span>{{ sum() | currency:'￥' }}</span></p> <p>运费:<span>{{iphone.fre | currency:'￥'}}</span></p> <p>总额:<span>{{ sum() + iphone.fre | currency:'￥'}}</span></p> </div> </div> <script type="text/javascript"> var app = angular.module("myApp",[]); app.controller('CartController',function ($scope) { $scope.iphone = { money: 5,num: 1,fre: 10 }; $scope.sum = function () { return $scope.iphone.money * $scope.iphone.num; }; //当总价>=100，运费为0；否则为￥10. $scope.$watch($scope.sum,function (newVal,oldVal) { console.log("newVal = " + newVal); console.log("oldVal = " + oldVal); $scope.iphone.fre = newVal >= 100 ? 0 : 10; }); }); </script> </body> </html>

原文链接：https://www.f2er.com/angularjs/148818.html