javascript - ng-change 与之前的值进行比较

Question

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

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

如何在 angularjs 中使用 ng-change 检查 $scope.name 是否仍然等于 Default？

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
    }
}

但为此目的 $watch 应该更好。我不认为 ng-change 会跟踪你的变量。 https://docs.angularjs.org/api/ng/type/ $rootScope.Scope