ng-與之前的值進行比較

Question

<input ng-model="name" ng-change=change() placeholder="name"> 
<button ng-click="check()"> 
$scope.name = 'Default'; 

$scope.change = function(i){ 
console.log(i) 
} 

如何檢查$ scope.name仍然等於Default在angularjs中使用ng-change？

Answer 1

<input ng-model="name" ng-change=change() placeholder="name"> 
<button ng-click="check()"> 

$scope.name = 'Default'; 
var oldV = $scope.name; 
$scope.change = function(i){ 
    if($scope.name === oldV) { 
     console.log('same'); 
    } else { 
     // update oldV here to latest if you want 
    } 
} 

但爲此目的，$ watch應該更好。 我不認爲ng-change跟蹤你的變量。 https://docs.angularjs.org/api/ng/type/ $ rootScope.Scope