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watch.html
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watch.html
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<!doctype html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>数据监听</title>
<script src="./org/angular.min.js"></script>
<script src="./org/underscore-min.js" ></script>
<link rel="stylesheet" href="./org/bootstrap.min.css">
<link rel="stylesheet" href="./org/font-awesome/css/font-awesome.min.css">
</head>
<body>
<div ng-app="hd" ng-controller="ctrl">
<!--标题：<input type="text" ng-model="title">{{error}}-->
标题：<input type="text" ng-model="new.title">{{error}}
</div>
<script>
var m = angular.module('hd', []);
m.controller('ctrl', ['$scope', function ($scope) {
// 监听变量
// $scope.title = ''
// $scope.$watch('title', function(n, o){ //数据监听，n新数据，o旧数据
// console.log(n.length);
// $scope.error = n.length > 4?'标题不能大于4位':'';
// })
//监听对象
$scope.new = {title:''}
$scope.$watch('new', function(n,o){
console.log(n.title)
$scope.error = n.title.length > 4 ? '标题不能超过4位' : ''
}, true)
}]);
</script>
</body>
</html>