JavaScript test Code

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Variable

var netprice = 8.99; alert (netprice);

String method

var string1 = "I am the first part of the string +"; var string2 = "I am the second part of the string"; var longstring = string1.concat (string2); alert (longstring); var string1 = "The quick brown Cat"; String1.indexof ("cat");//string1.indexof ("dog") ;

Inherited

functionPet () { This. Animal = "";  This. Name = "";  This. Setanimal =function(newanimal) { This. Animal =Newanimal; }     This. SetName =function(newName) { This. Name =NewName; }}varMycat =NewPet (); Mycat.setanimal ("Cat"); Mycat.setname ("Miao"); alert (Mycat.animal+ "is call" +mycat.name)functionDog () { This. Breed = "";  This. Setbreed =function(newbreed) { This. Breed =Newbreed; }}dog.prototype=NewPet ();varMydog =NewDog (); Mydog.setname ("Hou"); Mydog.setbreed ("Dog"); alert (Mydog.name+ "is a" + mydog.breed);

Detect with If function

If= document.getElementById (' id '); alert (myelement);} Else {alert ("getElementById cannot be used");};

Test JSON example

var jsonobject = {    "param1": "Value1",    "param2": "value2",    " Param3 ":" Value3 "}alert (jsonobject.param1);

Use eval ()

var user = ' {' username ': ' miniwyy ', ' Location ': ' China ', ' Height ': 1.70} '; var myObject = eval (' (' + user + ') '); alert (myobject.username) ;

Output to Page 3

var x = eval (4); Eval ("A=1;b=2;document.write (a+b);");

Json.parse ()

var Yori = ' {' height ': 1.7, ' age ': $, ' eyecolor ': ' Brown '} '; var myObject = json.parse (yori); var out = "";  for inch myObject) {    + = i + "=" + myobject[i] + "\ n";} alert (out);

Data serialization of JSON

var New  = 1.70= "Borwn"; alert (json.stringify (Yori));

Simulating associative arrays

var confence = {    "startday": "Monday",    "NextDay": "Tuesday",    " Endday ":" Wednesday "}alert (confence[" StartDay "]);

Use anonymous functions to add methods to objects

var user ={    "username": "Miniwyy",    "location": "China",    "height": 1.70,    function  (newName) {        this. Username= newName;    }} alert (user.username); var newname = Prompt ("Enter a new name"); User.setname (newname); alert (user.username) ;

The property value can be an array

var booklistobject = {    "Booklist": ["Foundation", "Dune", "Eon", "2001 A Space Odyssey", "Stranger In A Strange land "]}var book = booklistobject.booklist[2];alert (book);

JSON object

var booklistobject = {    "Booklist" : [        {"title": "Foundation", "Author": "Isaac Asimov "},        {" title ":" Dune "," Author ":" Frank Herbert "},        {" title ":" Eon "," Author ":" Greg Bea  R "},        {" title ":" 2001 A Space Odyssey "," Author ":" Arthur C. Clarke "},        {" title ":" Stranger In a Strange land "," Author ":" Robert A. Heinlein "}    ]}alert (booklistobject.booklist[2].author);

JavaScript test Code