You need to connect the array elements into a string with a certain character. The sample code is as follows:

var？ First,? b，c； ?

Answer? =? New? Array (a, b, c, d, e); ?

b？ =? a . join(“-)； ? //a-b-c-d-e？ Use-to splice array elements. =? a . join(“”)； ? //abcde

Second, string to array.

The implementation method is to cut a string into several strings according to a certain character and return them in the form of an array. The sample code is as follows:

var？ str？ =? ‘a b+ c+de’； var？ Answer? =? str . split('+')； ? //? 【ab，？ c，？ Germany]

var？ b？ =? str . split(“”)； ? //[a，？ b，？ +,? c，？ +,? d，？ e]