watch比较消耗性能，所以用完后就要消除监听
<!DOCTYPE html><html><head><meta charset="utf-8" /><title>作用域</title><script src="js/angular.min.js"></script><style type="text/css"></style></head><body ng-app="my-frist-app"> <div id="box" ng-controller="fristController" >商品数量：<input type="text" ng-model="count"/>商品单价：<input type="text" ng-model="price" />商品总价：{{count*price}}邮费：{{youFei}}总计：<p ng-bind="total"></p></div><script type="text/javascript">var myApp = angular.module('my-frist-app',[])// $watch 监听方法，监听变化myApp.controller('fristController',function($scope){//$scope.$watch('price*count',function(){//console.log("fuji")//});var watch = $scope.$watch('price',function(newValue,oldValue,$scope){console.log(newValue);console.log(oldValue)})// 销毁监听// watch();});</script></body></html>
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