这两个Javascript数组有什么区别？

Question

One is built like this:

var l1 = [23, 50, 63, 90, 10, 30, 155, 23, 18]

And the other is having elements pushed into it via browser automation:

var test = []
list1.each(($el) => {
    return test.push(+$el.get(0).innerText)
})

Answer 1

First one is mutated after logging, second one is logged after mutating. Try the following in the console:

var arr = [];
console.log(arr);//will log [] but can expand to an item with name 'one'
console.table(arr);//the actual value of arr at the time of logging
console.log(JSON.stringify(arr));//also actual value when logging
arr.push({name:'one'})

Answer 2

I believe .each returns an object with the value. So if you where to get the type of the $el than it would return obj and not number.