<!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title>angular.identity</title> </head> <body ng-app="indentityExample"> <h1>angular.identity</h1> <p> <span>描述:</span><br /> <span>返回他的第一参数的函数,次函数多用于函数编程</span> </p> <p> <span>使用方法:</span><br /> <span>angular.identity(value)</span> </p> <p> <span>参数:</span><br /> <span>value:用于返回</span><br /> </p> <p> <span>返回值:</span><br /> <span>value</span> </p> <hr /> <div ng-controller="indentitycon"> </div> </body> <script src="../../js/angular.1.3.0.js" type="text/javascript" charset="utf-8"></script> <script type="text/javascript"> angular.module('indentityExample', []).controller('indentitycon', function($scope){ //返回一个数的平方的方法 $scope.square = function(n){ return n * n; } //把上一个方法当做参数应用 $scope.getResule = function(fn, val){ return (fn || angular.identity)(val); } //定义一个变量 $scope.initVal = 5; var result = $scope.getResule($scope.square, $scope.initVal); $scope.aa = $scope.getResule($scope.square, $scope.initVal); console.log($scope.aa); }) </script> </html>