How to use the string attribute in js

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/ / define variables

Var S1 = "this is javascript"

/ / get the length of the string

Console.info (s1.length)

/ / get the character with index position 3

Console.info (s1.charAt (3))

/ / determine which index position of a character appears for the first time in a string

Console.info (s1.indexOf ("I"))

/ / intercept the string to get the string in the string

Var subs1 = s1.substring (3pc6)

Console.info (subs1)

/ / split the string into an array

Var sArray = s1.split ("")

/ / print the split array

For (var i in sArray) {

Console.info (Array [I])

}

/ / concatenate an array into a string

S2 = sArray.join ("")

Console.info (S2)

/ / practice

/ / the first method

/ / var words = ["America", "Greece", "Britain", "Canada", "China", "Egypt"]

/ / var count = 0

/ / for (I = 0; I