js string methods commonly used

1.charAt()

Find Returns the position of character

 var STR = "ABCDEFG" ;
         var S = str.charAt (5); // subscript character 5 of 
        the console.log (S); // F

2.charcodeAt()

Find Returns the position of a character code unicdoe

 var STR = "ABCDEFG" ;
         var S = str.charCodeAt (5); // subscript character code 5 unicdoe 
        the console.log (S); // 102

3.concat()

Connection String

 var str = "abc";
        var str1 = str.concat("a", "b", "c", "dsdafsdafsad");
        console.log(str1);//abcabcdsdafsdafsad

4.slice()

String interception

var str = "abcdefghijklm";
        var str1 = str.slice(1, 5);
        console.log(str1);//bcde

Please refer to detailed usage array usage.

5.split()

String into an array

 var str = "abcdefg"
        var str1 =str.split("")
        console.log(str);//abcdefg
        console.log(str1)//["a", "b", "c", "d", "e", "f", "g"]

6.substring()

String interception

 var STR = "ABCDEFGHIJKLM" ;
         var str1 str.substring = (1, 9); // start from a lower end to the lower side 9 9 that does not include a subscript 
        var str2 str.substring = (9, 1 ); 
        Console .log (str1); // bcdefghi 
        console.log (str2); // bcdefghi

7.substr()

String interception

var STR = "ABCDEFGHIJKLM" ;
         var str1 = str.substr (2, 6); // index number 2 from the start number 6 back 
        the console.log (str1); // cdefgh

8.indexOf()

Traversal strings

The search string contains a first parameter, such as return comprising a first subscript, stop searching, or -1 if not. The second parameter indicates the index from the beginning to find.

 var str = "abcdefabcjklm";
        var a = str.indexOf("abc")
        var b = str.indexOf("abc", 1);
        console.log(a);//0
        console.log(b);//6

9.toUpperCase

Turn uppercase

var str = "aAbBcCdD";
        console.log(str.toUpperCase());//AABBCCDD

10.toLowerCase

Small letter

 var str = "aAbBcCdD";
         console.log(str.toLowerCase());//aabbccdd

11.replace()

Replacement string

Only one match

var str = "a good weather day today" ;
         var str1 = str.replace ( "every day", "**" ); 
        console.log (str1); // this good weather days **

12.match()

Find string

 var str = "The weather today is good" ;
         var the Result = str.match ( "every day" ); 
        console.log (the Result); // [ "every day", index: 1, input: " Today the weather is good", groups: undefined ]

13.search()

Find the returned string subscript

var str = "The weather today is a good day" ;
         var the Result = str.search ( "every day" ); 
        console.log (the Result); // 1

js string methods commonly used

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