AngularJS API
API 意为 Application Programming Interface（应用程序编程接口）。
AngularJS 全局 API
AngularJS 全局 API 用于执行常见任务的 JavaScript 函数集合，如：
- 比较对象
- 迭代对象
- 转换对象
全局 API 函数使用 angular 对象进行访问。
以下列出了一些通用的 API 函数：
| API | 描述 |
|---|---|
| angular.lowercase() | 转换字符串为小写 |
| angular.uppercase() | 转换字符串为大写 |
| angular.isString() | 判断给定的对象是否为字符串，如果是返回 true。 |
| angular.isNumber() | 判断给定的对象是否为数字，如果是返回 true。 |
angular.lowercase()
实例
<div ng-app="myApp" ng-controller="myCtrl">
<p>{{ x1 }}</p>
<p>{{ x2 }}</p>
</div>
<script>
var app = angular.module('myApp', []);
app.controller('myCtrl', function($scope) {
$scope.x1 = "JOHN";
$scope.x2 = angular.lowercase($scope.x1);
});
</script>
<p>{{ x1 }}</p>
<p>{{ x2 }}</p>
</div>
<script>
var app = angular.module('myApp', []);
app.controller('myCtrl', function($scope) {
$scope.x1 = "JOHN";
$scope.x2 = angular.lowercase($scope.x1);
});
</script>
angular.uppercase()
实例
<div ng-app="myApp" ng-controller="myCtrl">
<p>{{ x1 }}</p>
<p>{{ x2 }}</p>
</div>
<script>
var app = angular.module('myApp', []);
app.controller('myCtrl', function($scope) {
$scope.x1 = "John";
$scope.x2 = angular.uppercase($scope.x1);
});
</script>
<p>{{ x1 }}</p>
<p>{{ x2 }}</p>
</div>
<script>
var app = angular.module('myApp', []);
app.controller('myCtrl', function($scope) {
$scope.x1 = "John";
$scope.x2 = angular.uppercase($scope.x1);
});
</script>
angular.isString()
实例
<div ng-app="myApp" ng-controller="myCtrl">
<p>{{ x1 }}</p>
<p>{{ x2 }}</p>
</div>
<script>
var app = angular.module('myApp', []);
app.controller('myCtrl', function($scope) {
$scope.x1 = "JOHN";
$scope.x2 = angular.isString($scope.x1);
});
</script>
<p>{{ x1 }}</p>
<p>{{ x2 }}</p>
</div>
<script>
var app = angular.module('myApp', []);
app.controller('myCtrl', function($scope) {
$scope.x1 = "JOHN";
$scope.x2 = angular.isString($scope.x1);
});
</script>
angular.isNumber()
实例
<div ng-app="myApp" ng-controller="myCtrl">
<p>{{ x1 }}</p>
<p>{{ x2 }}</p>
</div>
<script>
var app = angular.module('myApp', []);
app.controller('myCtrl', function($scope) {
$scope.x1 = "JOHN";
$scope.x2 = angular.isNumber($scope.x1);
});
</script>
<p>{{ x1 }}</p>
<p>{{ x2 }}</p>
</div>
<script>
var app = angular.module('myApp', []);
app.controller('myCtrl', function($scope) {
$scope.x1 = "JOHN";
$scope.x2 = angular.isNumber($scope.x1);
});
</script>
1、定义ng-app以及控制器，在输入框中填写值，x1和x2分别接收其大小写转换的值，并根据switch来判断true/false让其显示是否是字符串和数字
<div ng-app="myApp" ng-controller="myCtrl"> <input type="text" ng-model="myInput" ng-blur="blur()"> <p>输入的内容为：{{myInput}}</p> <p>变成小写：{{ x1 }}</p> <p>变成大写：{{ x2 }}</p> <p ng-switch = "x3"> 是不是字符串： <label ng-switch-when = "true">是</label> <label ng-switch-when = "false">不是</label> <label ng-switch-when = ""></label> </p> <p ng-switch = "x4"> 是不是数字： <label ng-switch-when = "true">是</label> <label ng-switch-when = "false">不是</label> <label ng-switch-when = ""></label> </p> </div>2、script内容：
<script> var app = angular.module('myApp', []); app.controller('myCtrl', function($scope) { $scope.blur = function(){ $scope.x1 = angular.lowercase($scope.myInput); $scope.x2 = angular.uppercase($scope.myInput); $scope.x3 = angular.isString($scope.myInput); // angular.isNumber 这里无效 // $scope.x4 = angular.isNumber($scope.myInput); $scope.x4 = !isNaN($scope.myInput); } }); </script>针对楼上说的angular.isNumber无效问题，解决可以使用如下方法：
var app = angular.module('myApp', []); app.controller('myCtrl', function($scope) { $scope.blur = function(){ if($scope.myInput ==''){ $scope.myInput = undefined; } if(!isNaN($scope.myInput)){ $scope.myInput = Number($scope.myInput); } $scope.x1 = angular.lowercase($scope.myInput); $scope.x2 = angular.uppercase($scope.myInput); $scope.x3 = angular.isString($scope.myInput); $scope.x4 = angular.isNumber($scope.myInput); } });