监听服务$watch
1、不需要在控制器脚本中注入,直接使用
2、监听任何想要监听的NG变量的值,并在这个值改变的时候调用回调函数
语法:$scope.$watch('想要监听的NG变量(不需要加$scope.)或字符串',回调函数)
代码示例:
<html ng-app='app' ng-controller='main' >
<head>
<meta charset="utf-8">
<meta name='viewport' content='width=device-width,user-scalable=no,initial-scale=1.0,maximum-scale=1.0,minimum-scale=1.0'>
<title ng-bind='mainTitle'></title>
<script src='js/angular.js'></script>
<script src='js/angular.route.min.js'></script>
<style>
</style>
</head>
<body >
<input type="text" ng-model='in'>
<script>
var app=new angular.module('app',[]);
app.controller('main',['$scope',function($scope){
$scope.in='';
$scope.$watch('in',function(){console.log('他变了')});
}])
</script>
</body>
</html>
