scope. watch(‘表達式的值’,’回調函數’)函數監視一個表達式，當表達式發生變化，就觸發一個回調函數
<!doctype html>
<html lang="en" ng-app="moduleApp">
<head>
<meta charset="UTF-8">
<title>Document</title>
<script src="http://apps.bdimg.com/libs/angular.js/1.3.9/angular.min.js"></script>
</head>
<body>
<form action="" ng-controller="fundController">
<input type="text" ng-model="fundNum.text">
<p>改動input的值{{fundNum.inter}}</p>
</form>
<script>
var moduleApp=angular.module('moduleApp',[]);
moduleApp.controller('fundController',function($scope){
$scope.fundNum={
text:0
}
computNeed=function(){
$scope.fundNum.inter=$scope.fundNum.text*10;
}
$scope.$watch('fundNum.text',computNeed);
});
</script>
</body>
</html>
