对于观察对象范围变量，是$ scope。$ watch with objectEquality设置为true OR $ scope。$ watchCollection更好？
对于一个$ scope对象变量(如15个属性，一些嵌套的2级深度)用视图中的输入元素和ng-model更新，$ scope有多糟糕$ watch with objectEquality设置为true？这是一件值得避免的事吗？
是$ watchCollection更好的解决方案吗？
我正在寻找容易的胜利，以提高我的AngularJS应用程序的性能(我仍然坚持在v1.2.2)。
// ctrl scope var
$scope.filters = {
name: '',info: {test: '',foo: '',bar: ''},yep: ''
// etc ...
}
// ctrl watch ?
$scope.$watch('filters',function(newVal,oldVal) {
if(newVal !== oldVal) {
// call with updated filters
}
},true);
// or ctrl watch collection ?
$scope.$watchCollection('filters',oldVal) {
if(newVal !== oldVal) {
// call with updated filters
}
});
// view input with ng-model
<input type="text" ng-model="filters.name" />
<input type="text" ng-model="filters.info.test" />
<input type="text" ng-model="filters.yep" />
// etc ...
The
$watchCollection()function is a sort-of mid-ground between the
two$watch()configurations above. It’s more in-depth than the
vanilla $watch() function; but,it’s not nearly as expensive as the
deep-equality$watch()function. Like the$watch()function,the
$watchCollection()works by comparing physical object references;
however,unlike the $watch() function,the$watchCollection()goes
one-level deep and performs an additional,shallow reference check of
the top level items in the collection.
