Javascript-string Object

Javascript-string Object

<! DOCTYPE html>//common methods of strings        //1.charAt () returns the character at the specified positionConsole.log (' =========charat () ========= '); varABC = ' Telephone '; Console.log (Abc.charat (4));//P        //2.concat () connection string (array object also has this method for two arrays of connections)Console.log (' =========concat () ========= '); varA1 = ' My '; vara2 = ' name ';   Console.log (A1.concat (A2)); //myname        //3.indexOf (Searchvalue,fromindex) retrieves a string that returns the position of the first occurrence of a specified string value in a string        //Fromindex index value is: 0~ string length-1        //return if not found-1        varB1 = ' detection '; Console.log (' =========indexof () ========= '); Console.log (B1.indexof (' a '));//-1Console.log (B1.indexof (' e '));//1        //4.lastIndexOf () with indexof () backwards backward, returns the index of the character in the stringConsole.log (' =========lastindexof () ========= '); Console.log (B1.lastindexof (' E '));//3        //5.match (searchvalue|regexp) found a match for one or more regular expressions. The value returned isConsole.log (' =========match () ========= '); varSmatch = ' Hello World '; Console.log (Smatch.match (' L '));//["L", index:2, Input: "Hello World"]Console.log (Smatch.match (/l/));//["L", index:2, Input: "Hello World"]Console.log (Smatch.match (/l/g));//["L", "L", "L"] global match        //6.replace () replaces substrings that match regular expressionsConsole.log (' =========replace () ========= '); varSreplace = ' tony#163.com '; Console.log (Sreplace.replace (‘#‘, ‘@‘) ); Console.log (Sreplace.replace (/\d+/, ' 789 ') ); Console.log (Sreplace.replace (/(\w+) # (\w+)/, "$2#$1") ); //The 7.search () method is used to retrieve a substring specified in a string, or to retrieve a substring that matches a regular expression.         //returns the starting position of the first substring in the value stringobject that matches the regexp.         //if not found return-1Console.log (' =========search () ========= '); varSsearch = ' L, Index:2, Input:hello World '; Console.log (Ssearch.search (' 2 ') ); Console.log (Ssearch.search (K) ); //8.slice (start,end) extracts a fragment of a string and returns the extracted part in a new string.         //English [Sla?s] vt. Cut into slices;Console.log (' =========slice () ========= '); varSslice = ' [email protected] '; Console.log (Sslice.slice (5));//163.comConsole.log (Sslice.slice (4, 6));//@1        //the 9.split (Separator,howmany) method is used to split a string into a string array.         //English [Spl?t] Vt. split; separate < slang > (swift) leave; share        //Parameters: separator, length        //return value: Array        //The action performed by String.Split () is the opposite of what Array.join does. Console.log (' =========split () ========= '); varSsplit = ' jack+ jane+ jay+ Tony '; vars = ssplit.split (' + ')); Console.log (SinstanceofArray);//trueConsole.log (s); Console.log (Ssplit.split (' + ', 2) ); //The 10.substr (start,length) method extracts a specified number of characters from the start subscript in a string. Console.log (' =========substr () ========= '); varSsubstr = ' Hello world! '; Console.log (Ssubstr.substr (2));//Llo world!Console.log (Ssubstr.substr (2, 7));//Llo wor        //the 11.substring (start,stop) method is used to extract the character of a string intermediary between two specified subscripts.         //parameter is a non-negative integerConsole.log (' =========substring () ========= '); varssubstring = ' Hello world! '; Console.log (Ssubstring.substring (2));//Llo world!Console.log (Ssubstring.substring (2, 7));//Llo W</script>
Javascript-string Object