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angularjs中使用$scope.$watch监控对象模型的变化

如果对象模型发生变化时,可以使用$scope.$watch监控变化

<html ng-app="myApp"><head><title>angularjs-demo</title><script type="text/javascript" src="lib/angularjs/angular.min.js" charset="utf-8"></script></head><body ng-controller="ctrl"><input type="text" ng-model="text1" ng-model-options="{ updateOn: ‘blur‘ }" /><div>输入框内容改变次数:{{count}}</div></body><script type="text/javascript">var app = angular.module(myApp, []).controller(ctrl, function($scope){    $scope.count = 0;    $scope.$watch(text1,function(){        $scope.count++;    });});</script></html>

 

稍微改一下,输出修改前后的内容:

<html ng-app="myApp"><head><title>angularjs-demo</title><script type="text/javascript" src="lib/angularjs/angular.min.js" charset="utf-8"></script></head><body ng-controller="ctrl"><input type="text" ng-model="text1" ng-model-options="{ updateOn: ‘blur‘ }" /><div>输入框内容改变次数:{{count}}</div><div>原内容:{{content1}}</div><div>新内容:{{content2}}</div></body><script type="text/javascript">var app = angular.module(myApp, []).controller(ctrl, function($scope){    $scope.count = 0;    $scope.$watch(text1,function(newValue,oldValue){        $scope.count++;        $scope.content1 = oldValue;        $scope.content2 = newValue;    });});</script></html>

 

angularjs中使用$scope.$watch监控对象模型的变化