angularjs $ watch無法檢測到對象中的Property變化

Question

我正在為$scope對象設置watch，除非整個值都被更改，否則不會觸發$watch change事件

范例：

//Some where in .run function i set rootScope and set $watch too.
$rootScope.config = {date:'11/4/2015',moreValues:'etc'};

//setting $watch
$rootScope.$watch('config',function(new,old) {
console.log('config value changed :)',new);
});

//----->Inside Controller----------

//NOw THIS WILL NOT TRIGGER $watch
$rootScope.config.date = 'another day';

//Same as this, it will also not trigger $watch
var temp = $rootScope.config;
temp.date = 'another day';
$rootScope.config = temp;

//YET THIS WILL WORK JUST FINE :) AND WILL TRIGGER $watch
var temp = angular.copy($rootScope.config);
temp.date = 'another day';
$rootScope.config = temp;

有人可以告訴我為什么會這樣嗎？ 有沒有更好的方法來觸發$watch對象屬性的更改？

Answer 1

您可以使用$ watchCollection或將第三個參數傳遞為true

$rootScope.$watch('config',function(value,old) {
console.log('config value changed :)',value);
}, true);

要么

$rootScope.$watchCollection('config',function(value,old) {
console.log('config value changed :)',value);
});

• 范圍$ watch（）與$ watchCollection（）在AngularJS中