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AngularJS's $watch method (monitoring actions)

黄舟Original: 2017-02-18 13:36:161210browse

1. Problem background

The $watch method in AngularJS to monitor data changes

2. Implementation source code

<!DOCTYPE html>
<html>
	<head>
		<meta charset="UTF-8">
		<title>AngularJS之$watch方法（监控动作）</title>
		<script src="http://apps.bdimg.com/libs/angular.js/1.4.6/angular.min.js"></script>
		<style>
			body{
				font-size: 12px;
				font-family: "微软雅黑";
				background-color: #F8EFC0;
				backface-visibility: visible;
			}
			p{
				margin: 10px 10px 10px 10px;
			}
		</style>
		<script>
			var app = angular.module("watchApp",[]);
			app.controller("watchCon",[&#39;$scope&#39;,function($scope){
				$scope.count = 0;
				$scope.username = "";
				$scope.$watch(&#39;username&#39;,function(){
					$scope.count++;
				});
			}]);
		</script>
	</head>
	<body ng-app="watchApp">
		<p ng-controller="watchCon">
			<p>
				<input type="text" id="username" ng-model="username" maxlength="12" autocomplete="on"/>
			</p>
			<p>
				{{count}}
			</p>
		</p>
	</body>
</html>

3. Implementation result

(1) Initialization

AngularJSs $watch method (monitoring actions)

## (2) Change the input box value

AngularJSs $watch method (monitoring actions)

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