var myNumber = 24; // 24
var myString = myNumber.toString(); // "24"

var myNumber = 24; // 24
var myString = String(myNumber); // "24"

 var myString = "coming,apart,at,the,commas";
 var substringArray = myString.split(","); // ["coming", "apart", "at", "the", "commas"]
 var arrayLimited = myString.split(",", 3); // ["coming", "apart", "at"]

 var myString = "You're quite a character.";
 var stringLength = myString.length; // 25

 var stringOne = "Johnny Waldo Harrison Waldo";
 var wheresWaldo = stringOne.indexOf("Waldo"); // 7

 var stringOne = "Johnny Waldo Harrison Waldo";
 var wheresWaldo = stringOne.lastIndexOf("Waldo"); // 22

 var slugger = "Josh Hamilton";
 var betterSlugger = slugger.replace("h Hamilton", "e Bautista");
 console.log(betterSlugger); // "Jose Bautista"

 var myString = "She sells automotive shells on the automotive shore";
 var newString = myString.replace(/automotive/g, "sea");
 console.log(newString); // "She sells sea shells on the sea shore"

var myString = "Birds of a Feather";
var whatsAtSeven = myString.charAt(7); // "f"

 var myString = "Birds of a Feather";
 var whatsAtSeven = myString.charCodeAt(7); // "102"
 var whatsAtEleven = myString.charCodeAt(11); // "70"

 var stringOne = "Knibb High football ";
 var stringTwo = stringOne.concat("rules."); // "Knibb High football rules"

var stringOne = "Knibb ";
var stringTwo = "High ";
var stringThree = "football ";
var stringFour = "rules.";
var finalString = stringOne.concat(stringTwo, stringThree, stringFour);
console.log(finalString); // "Knibb high football rules."

 var stringOne = "abcdefghijklmnopqrstuvwxyz";
 var stringTwo = stringOne.slice(5, 10); // "fghij"

var stringOne = "abcdefghijklmnopqrstuvwxyz";
var stringTwo = stringOne.substring(5, 10); // "fghij"

var stringOne = "abcdefghijklmnopqrstuvwxyz";
var stringTwo = stringOne.substr(5, 10); // "fghijklmno"

 var stringOne = "Speak up, I can't hear you.";
 var stringTwo = stringOne.toLocaleUpperCase(); // "SPEAK UP, I CAN'T HEAR YOU"
 var stringThree = stringOne.toUpperCase(); // "SPEAK UP, I CAN'T HEAR YOU"

 var stringOne = "YOU DON'T HAVE TO YELL";
 var stringTwo = stringOne.toLocaleLowerCase(); // "you don't have to yell"
 var stringThree = stringOne.toLowerCase(); // "you don't have to yell"

var myString = "How much wood could a wood chuck chuck";
var myPattern = /.ood/;
var myResult = myString.match(myPattern); // ["wood"]
var patternLocation = myResult.index; // 9
var originalString = myResult.input // "How much wood could a wood chuck chuck"

var myString = "How much wood could a wood chuck chuck";
var myPattern = /.huck/;
var myResult = myPattern.exec(myString); // ["chuck"]
var patternLocation = myResult.index; // 27
var originalString = myResult.input // "How much wood could a wood chuck chuck"

 var myString = "Assume";
 var patternLocation = myString.search(/ume/); // 3

var myString = "chicken";
var myStringTwo = "egg";
var whichCameFirst = myString.localeCompare(myStringTwo); // -1 (except Chrome, which returns -2)
whichCameFirst = myString.localeCompare("chicken"); // 0
whichCameFirst = myString.localeCompare("apple"); // 1 (Chrome returns 2)
stringObject.localeCompare(target)//公式