Chrome的JavaScript控制台是否懒于评估数组？

根据Eric的解释，这是由于console.log()排队，它打印了数组（或对象）的更高值。

可以有5个解决方案：

1. arr.toString() // not well for [1,[2,3]] as it shows 1,2,3
2. arr.join() // same as above
3. arr.slice(0) // a new array is created, but if arr is [1, 2, arr2, 3] // and arr2 changes, then later value might be shown
4. arr.concat() // a new array is created, but same issue as slice(0)
5. JSON.stringify(arr) // works well as it takes a snapshot of the whole array // or object, and the format shows the exact structure