[英]How to use AngularJS $scope?
我有一个段落和一个柜台。 当有人使用AngularJS点击段落时,我想更新计数器。 我写了以下代码:
<!DOCTYPE html>
<html>
<head>
<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.4.8/angular.min.js"></script>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.1.1/jquery.min.js"></script>
</head>
<body>
<p>Click on this paragraph.</p>
<div ng-app="myApp" ng-controller="myCtrl">
<h2>{{ count }}</h2>
</div>
<script>
var $ang;
var app = angular.module('myApp', []);
app.controller('myCtrl', function($scope) {
$ang=$scope;
$ang.count=10;
});
$(document).ready(function(){
$("p").click(function(){
console.log("The paragraph was clicked.");
$ang.count=$ang.count-1;
});
});
</script>
</body>
</html>
但它不起作用。 我想我以错误的方式使用$scope
但我不确定如何解决它。
而是按照有角度的方式进行操作,只需在主体上移动ng-app
& ng-controller
指令就可以将所有东西包裹在角度上下文中,然后ng-click
p
标签并在那里执行所需的任务
标记
<body ng-app="myApp" ng-controller="myCtrl">
<p ng-click="increamentCount()">Click on this paragraph.</p>
<div>
<h2>{{ count }}</h2>
</div>
<body>
码
var app = angular.module('myApp', []);
app.controller('myCtrl', function($scope) {
$scope.count = 10;
$scope.increamentCount = function(){
$scope.count = $scope.count + 1;
}
});
它应该是:
<!DOCTYPE html>
<html>
<head>
<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.4.8/angular.min.js"></script>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.1.1/jquery.min.js"></script>
</head>
<body>
<div ng-app="myApp" ng-controller="myCtrl">
<p ng-click="click()">Click on this paragraph.</p>
<h2>{{ count }}</h2>
</div>
<script>
var $ang;
var app = angular.module('myApp', []);
app.controller('myCtrl', function($scope) {
$scope.count = 10;
$scope.click = function(){
$scope.count=$scope.count-1;
}
});
</script>
</body>
</html>
您的代码中有几个错误。 我已经重构了一下。 确保正确使用ng-app和ng-controller 。 不要将jquery与angular结合使用。 您可以使用$ watch函数观察范围更改 - 此方法在计算方面很昂贵,不应过度使用。
<!DOCTYPE html>
<html ng-app="myApp">
<head>
<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.4.8/angular.min.js"></script>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.1.1/jquery.min.js"></script>
</head>
<body>
<div ng-controller="myCtrl">
<p ng-click="onClick()">Click on this paragraph.</p>
<h2>{{ count }}</h2>
</div>
</div>
<script>
angular
.module('myApp', ['ng'])
.controller('myCtrl', function($scope) {
$scope.count = 10
$scope.onClick = function () {
$scope.count--
}
// this is how you can observe state
// changes outside of event handlers
$scope.$watch('count', function(newValue, oldValue) {
console.log("The paragraph was clicked.")
})
})
</script>
</body>
</html>
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