const str = 'h i'Define a constant str as a string hi
str.split() This is to split the string directly as a whole and the output result is an array ['hi']
str.split('') with a single quote means that every character in the string, including spaces, is converted into each element in the array.
reverse() means to reverse the elements, that is, to re-arrange the elements in the array in reverse order
Here's the join() function to explain
const fruits = ["banana","apple","orange"]
console.log(fruits.join("and"))Output: banana and apple and orange
This is the split array
join() converts the array to a string, the default is to use commas to separate
If it is replaced with other delimiters, such as and the string converted from the linked array, the expression is: join("and")