Javascript array always returns empty array in iOS9 beta

Question

I have a very weird issue happening in iOS9 beta 5 - arrays seem to be empty even when elements have been added.

Sounds crazy but here's what it looks like in Safari iOS9 - this is just on the google homepage, no plugins - just vanilla webkit/javascript:

Whereas on Safari desktop, I see the correct behaviour:

Is anyone else having this issue?

Here's the code to reproduce:

myArray = ['cat', 'dog', 'fish']  
console.log(myArray.length)  
console.log(myArray)  
console.log(myArray.slice(0,1))  
console.log(myArray.indexOf('fish')) 

Thanks!

Answer 1

It looks like you are using Safari 8 to inspect iOS 9. You should be using Safari 9 or later to inspect iOS 9. Safari 9 is available on El Capitan, Yosemite, and Mavericks.

You may also use a WebKit Nightly on Yosemite and Mavericks to get equivalent behavior.

Answer 2

这似乎是由toString的实现引起的， console.log正在调用，而不是一个空数组。

Answer 3

The problem is with the console. You can see the value to debug using alert if you need to.

eg: alert(['cat', 'dog']) . It will pop up the result you need.

I had a similar issue when I was using replaceAll method. It does not have support in ios/safari 12. If you are facing this probably you can have issues with some functions like the replaceAll. For my case I had to use a polyfill .