Angularjs 雙向綁定時字符串的轉(zhuǎn)換成數(shù)字類型的問題

更新時間：2017年06月12日 15:59:15 作者：致良知的萌新

這篇文章主要介紹了Angular js雙向綁定時字符串的轉(zhuǎn)換成數(shù)字類型的問題,需要的朋友可以參考下

問題：

<!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">結果為 <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>

顯示結果為

但是，我要是輸入50，想要結果為60

因為這個是字符串類型需要轉(zhuǎn)換成數(shù)字類型

解決方法：

<!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">結果為 <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>

顯示即可正常即是在 {{first *1+second*1}}顯示的時候，轉(zhuǎn)換了一下

或者，啟用事件監(jiān)聽

<!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">結果為 <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>