Summary of common methods of JavaScript String objects_javascript skills

Strings are immutable. The string method does not change the content of the original string, but returns a new string.

charAt(): Returns the character at the specified position.

concat(): Concatenates two string literals and returns a new string.

indexOf():indexOf() method returns the position of the first occurrence of the specified value in the string object.

match(): Use regular expressions to compare with strings.

replace(): is used to directly compare the regular expression and the string, and then replace the matched substring with the new substring.

slice(): Extract a string area and return a new string.

split(): Split the string object into a string array by splitting the string into strings.

substr(): Returns the substring starting from the specified position to the specified length in the string.

substring(): Returns the substring between two indices of the string (or to the end of the string).

Unlike the slice() and substr() methods, substring() does not accept negative arguments.

trim(): Remove blank characters at both ends of a string.

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