ionic select默认值不出来

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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<script src="http://cdn.static.runoob.com/libs/angular.js/1.4.6/angular.min.js"></script>
</head>
<body>
<div ng-app="myApp" ng-controller="myCtrl">
<p>选择网站:</p>
<select ng-model="selectedSite">
<option ng-repeat="x in sites" value="{{x.url}}">{{x.site}}</option>
</select>
<h1>你选择的是: {{selectedSite}}</h1>
</div>
<script>
var app = angular.module('myApp', []);
app.controller('myCtrl', function($scope) {
$scope.sites = [
{site : "Google", id: 1},
{site : "Runoob", id: 2},
{site : "Taobao", id: 3}
];
$scope.selectedSite=$scope.sites[0].url;
});
</script>
<p>该实例演示了使用 ng-repeat 指令来创建下拉列表，选中的值是一个字符串。</p>
</body>
</html>

以上这段代码设置select默认值不成功,原因是应为select.value是字符串,所以将

$scope.selectedSite=$scope.sites[0].url;

改为

$scope.selectedSite=String($scope.sites[0].url);

即可

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