观察多个 $scope 属性 [英] Watch multiple $scope attributes

问题描述

有没有办法使用 $watch

例如

$scope.$watch('item1, item2', function () { });

推荐答案

从 AngularJS 1.3 开始，有一个名为 $watchGroup 用于观察一组表达式.

Starting from AngularJS 1.3 there's a new method called $watchGroup for observing a set of expressions.

$scope.foo = 'foo';
$scope.bar = 'bar';

$scope.$watchGroup(['foo', 'bar'], function(newValues, oldValues, scope) {
  // newValues array contains the current values of the watch expressions
  // with the indexes matching those of the watchExpression array
  // i.e.
  // newValues[0] -> $scope.foo 
  // and 
  // newValues[1] -> $scope.bar 
});

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