Angular js 双向绑定时字符串的转换成数字类型的问题 - Web

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Angular js 双向绑定时字符串的转换成数字类型的问题

2017-10-13 10:50:06 【大中小】浏览:1745次

问题：

<!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">

<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"></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"></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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