更新数组时不会触发模型的更改事件?

问题描述

使用backbone.js...

Using backbone.js...

@model.bind 'change', ()-> console.log 'updated'

addIndex = (index) =>
    array = @model.get('array')
    array.push index
    @model.set
        array: array

这会完美地更新模型，但不会触发更改事件.有谁知道我发布的内容为什么?

This updates the model perfectly but doesn't trigger the change event. Does anyone know why from looking at what I posted?

我添加了这个，它触发了更改事件:

I added this and it triggers the change event:

@model.set
    test: ''

num = 0
setInterval ()=>
    num++
    @model.set
    test: num
, 3000

我添加了这个，它不会触发更改事件:

I added this and it doesn't trigger the change event:

@model.set
    test: []

num = 0
setInterval ()=>
    console.log 'testupdate'
    num++
    test = @model.get('test')
    test.push num
    @model.set
        test: test
, 3000

推荐答案

Brian 关于原因的回答太棒了！

Brian's answer as to the reason is awesome!

想要提供另一种方法来获得你想要的东西，而不是把它清空或克隆数组.

Wanted to present another way to get what you want instead of nulling it out or cloning the array.

只需自己手动触发更改:

Just manually trigger the change yourself:

addIndex = (index) =>
    array = @model.get('array')
    array.push index
    @model.trigger('change:array',@model, array)

这篇关于更新数组时不会触发模型的更改事件?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持跟版网！