javascript - console.log(["2","3"].push("1")) Why is the result 3

Question

javascript

Answer 1

push() 方法可向数组的末尾添加一个或多个元素，并返回新的长度。

3 is actually the length of the new array.

Answer 2

Experiment yourself, push execution will return the length of the array

Answer 3

What is printed is push的返回值，pushreturning the new length

Answer 4

push() adds one or more elements to the end of the array and returns the new length.

Reference http://www.w3school.com.cn/js...

Answer 5

The

push() method adds one or more elements to the end of the array and returns the new length of the array, so what is printed is the length of the array.

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