Summary of methods for manipulating strings in JS

1: concat() combines two or more characters of text and returns a new string

1	var f1 ="hello";
2	var f2="world";
3	document.write(f1.concat(f2)) //hello world

2:indexof() Returns the index of the first occurrence of a substring in the string. If there is no match, returns -1

##1var f3="hello world"2 console.log(f3.indexOf('world')) //63console.log(f3.indexOf(' World')) //-14##Note

	##console.log(f3.indexOf('hello')) / /0

: index

Of is case sensitive

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

1var f4="hello world";2console.log(f4.charAt(1)) //e3console.log(f4) //hello world4:lastIndexOf() method can return the last occurrence position of a specified string value, and search from back to front at the specified position in a string .

1var f3="hello world"2console. log(f3.lastIndexOf('world')) //6console.log(f3.lastIndexOf('World')) / /-1console.log(f3.lastIndexOf('hello')) //05:substring() – Returns a substring of a string. The parameters passed in are the starting position and the ending position (not required). Note: The parameter cannot be a negative number

	##3
	4

##1

var f5="hello world"2console.log(f5.substring(3)) //lo world3console.log(f5.substring(3,8) ) //lo wo7:replace() – Used to find a string that matches a regular expression, and then replace the matching string with a new string.

	6:match() – Checks whether a string matches a regular expression.

8:search() – Perform a regular expression matching search. If the search is successful, the matching index value in the string is returned. Otherwise, -1 is returned.​

9:slice() – Extract a part of the string and return a new string. (The parameter can be a negative number)

##1

var f6="hello world"#10: split() – method is used to split a string into an array of strings.

2	console.log(f6.slice(6)) //world
3	console.log(f6.slice(6,9)) //wor

1

var f7="hello world";11:toLowerCase() – Convert the entire string to lowercase letters. 　

2	console .log(f7.split("")); //["h", "e", "l", "l", "o", " ", "w", "o", "r", "l", "d"]
3	console.log(f7.split(" ")); //["hello", "world" ]
4	console.log(f7.split(" ",1)); //["hello"]
	12:toUpperCase() – Convert the entire string to uppercase letters.

　

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