我们经常需要在 UI 上，例如在弹出框、加载框、其他弹出层中显示或隐藏背景层。
在组件中可以使用$ionicBackdrop.retain()来显示背景层，使用$ionicBackdrop.release()隐藏背景层。
每次调用retain后，背景会一直显示，直到调用release消除背景层。
<body ng-app="starter" ng-controller="actionsheetCtl" > <ion-pane> <ion-content > <h2 ng-click="action()">$ionicBackdrop</h2> </ion-content> </ion-pane> </body>
<html>
<head>
<meta charset="utf-8">
<meta name="viewport" content="initial-scale=1, maximum-scale=1, user-scalable=no, width=device-width">
<title>芝麻教程(web3.xin)</title>
<link href="//cdn.bootcss.com/ionic/1.3.0/css/ionic.css" rel="stylesheet">
<script src="//cdn.bootcss.com/ionic/1.3.0/js/ionic.bundle.js"></script>
<script type="text/javascript">
angular.module('starter', ['ionic'])
.run(function($ionicPlatform) {
$ionicPlatform.ready(function() {
// Hide the accessory bar by default (remove this to show the accessory bar above the keyboard
// for form inputs)
if(window.cordova && window.cordova.plugins.Keyboard) {
cordova.plugins.Keyboard.hideKeyboardAccessoryBar(true);
}
if(window.StatusBar) {
StatusBar.styleDefault();
}
});
})
.controller( 'actionsheetCtl',['$scope','$timeout' ,'$ionicBackdrop',function($scope,$timeout,$ionicBackdrop){
$scope.action = function() {
$ionicBackdrop.retain();
$timeout(function() { //默认让它1秒后消失
$ionicBackdrop.release();
}, 1000);
};
}])
</script>
</head>
<body ng-app="starter" ng-controller="actionsheetCtl" >
<ion-pane>
<ion-content >
<h2 ng-click="action()">$ionicBackdrop</h2>
</ion-content>
</ion-pane>
</body>
</html> 