时间：2021-07-01 10:21:17 帮助过：3人阅读
<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <script src="http://cdn.static.runoob.com/libs/angular.js/1.4.6/angular.min.js?1.1.11"></script> </head> <body> <div ng-app="myApp"> <p ng-controller = "myContrl">结果为 <span ng-bind="" ></span> <input type="text" ng-model="first">{{first+second}}</p> </div> <script>var app = angular.module("myApp",[]); app.controller("myContrl",function($scope){ $scope.first = 5; $scope.second =10; });</script> </body> </html>
显示结果为
但是，我要是输入50，想要结果为60
因为这个是字符串类型需要转换成数字类型
解决方法：
<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <script src="http://cdn.static.runoob.com/libs/angular.js/1.4.6/angular.min.js?1.1.11"></script> </head> <body> <div ng-app="myApp"> <p ng-controller = "myContrl">结果为 <span ng-bind="" ></span> <input type="text" ng-model="first">{{first *1+second*1}}</p> </div> <script>var app = angular.module("myApp",[]); app.controller("myContrl",function($scope){ $scope.first = 5; $scope.second =10; });</script> </body> </html>
显示即可正常 即是在 {{first *1+second*1}}显示的时候，转换了一下
或者，启用事件监听
<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <script src="http://cdn.static.runoob.com/libs/angular.js/1.4.6/angular.min.js?1.1.11"></script> </head> <body> <div ng-app="myApp"> <p ng-controller = "myContrl">结果为 <span ng-bind="" ></span> <input type="text" ng-model="first">{{total}}</p> </div> <script>var app = angular.module("myApp",[]); app.controller("myContrl",function($scope){ $scope.first = 5; $scope.second =10; $scope.total = parseInt($scope.first)+parseInt($scope.second); $scope.$watch(function(){return $scope.first; },function(newValue,oldValue){ if(newValue != oldValue){ $scope.total = parseInt($scope.first)+parseInt($scope.second); } }); });</script> </body> </html>
也能输出正确结果
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