Native methods of javascript string manipulation_Basic knowledge

join([separator]) array elements are combined into strings

toString() represents an array as a string

reverse() array reversal--change the original array itself

valueOf() returns the array value

Copy code The code is as follows:

toUpperCase()--change to uppercase

charAt(index)--points to a certain character

substring(begin,len)--truncate string

Copy code The code is as follows:

Run result:

Copy code The code is as follows:

JAVASCRIPT
3
java

indexOf--determine whether a certain character exists in the string

Copy code The code is as follows:

Do you guys know anything about the native methods of operating strings in JavaScript? In many cases, these native methods can easily achieve the functions we need.