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[vue] vue使用v-for遍历对象时，是按什么顺序遍历的？如何保证顺序？ #463

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haizhilin2013 opened this issue Jun 22, 2019 · 3 comments
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[vue] vue使用v-for遍历对象时，是按什么顺序遍历的？如何保证顺序？ #463

haizhilin2013 opened this issue Jun 22, 2019 · 3 comments
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@haizhilin2013
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[vue] vue使用v-for遍历对象时，是按什么顺序遍历的？如何保证顺序？
@haizhilin2013 haizhilin2013 added the vue vue label Jun 22, 2019
@April-Zheng
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在遍历对象时，会按 Object.keys() 的结果遍历，但是不能保证它的结果在不同的 JavaScript 引擎下都一致。

@webread
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webread commented Jul 17, 2019

---值value---{{v}}---键key---{{k}}----索引index----{{i}}

@haungxv
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haungxv commented Aug 12, 2019

image
1、会先判断是否有iterator接口，如果有循环执行next()方法
2、没有iterator的情况下，会调用Object.keys()方法，在不同浏览器中，JS引擎不能保证输出顺序一致
3、保证对象的输出顺序可以把对象放在数组中，作为数组的元素

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@haizhilin2013 @April-Zheng @webread @haungxv