我如何观察阵列变化，看看添加了哪些新元素？ [英] How can I observe array changes and see which new element is added?

问题描述

onArrayChanged: function(obj, keyName, value) {

    // What is value here, exactly?

}.property('array.@each')

元素被添加到数组中，如何知道添加了哪个值？另一方面，当一个值从数组中删除时，该如何访问？

When an element is added to the array, how do I know which value was added? LIkewise, when a value is removed from the array, how do I access that?

推荐答案

看看 addArrayObserver ，见 http://jsfiddle.net/pangratz666/EE65Z/ ：

var a = Ember.A('a b c d e f g'.w());

var o = Ember.Object.create({
    arrayWillChange: Ember.K,
    arrayDidChange: function(array, start, removeCount, addCount) {
        console.log(arguments);
    }
});

a.addArrayObserver(o);

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