JavaScript Short Summary 1

javascript--script Language Host file NetScape JSScript JS One, JavaScript basic syntax.

(a) Data type and variable type. Data type: integer, Decimal, Layout, string, datetime, array

Variable type: var

Cast: parseint () parsefloat () IsNaN ()

The parseint () usage transforms the input string into an int type. The first letter is not a number, and the result is Nan (not a);

In the middle of the character is not a number, the content after the character will not be resolved, only the preceding content, the string is all numbers, all displayed as int type. Parsefloat () use ibid.

IsNaN () Determines whether it is true.

(b) array var array name = new Array ([length]); "Counterfeit" array a.length-length a[subscript] = value. a[Subscript]

(c) Function function name (formal parameter) {

} function Showstr (a) {

}

Second, DOM operation Dom-document object Model document objects.

Tree: Linear model, tree model, mesh model window History location document

The verb of the noun behavior of the object--object characteristic

(a) window------The following 1-6 articles will be used frequently

1. Alert () No return value Window.alert ();

2. [var a =]window.confirm ("Can you run over the leopard?")     "); The contents of the brackets are not meaningful, only the confirm () has a return value of true, false when judged

Prompt (); --infrequently used, no need to remember, input

3. open (); Open ("Address", "_blank/_self", "new Window Features"); [var a =]window.open ("http://www.sina.com.cn"); The content inside the brackets doesn't make sense. Opens the page in a new window and returns a new window. A is also a variable of window type. Detailed translation required. Website: http://www.cnblogs.com/xianshui/p/4442699.html

4.Close (); Window.close ();

5. SetTimeout ("code", number of milliseconds) after the specified number of milliseconds, execute code once.  function ShowTime () {var date = new Date ();  document.getElementById ("hh"). InnerHTML = date;   Window.settimeout ("ShowTime ()", 1000); } window.settimeout ("ShowTime ()", 1000);

Open the page, five seconds after the pop-up ads, and then 5 seconds ads off ************ var A;    function Openad () {a = window.open ("http://www.sina.com.cn", "_blank", "width=200 height=200 toolbar=no top=0 left=0"); Window.settimeout ("Closead ()", 5000); } function Closead () {a.close ();} window.settimeout ("Openad ()", 5000);

6. SetInterval ("code", number of milliseconds) executes code once every specified number of milliseconds.  function ShowTime () {var date = new Date (); document.getElementById ("hh"). InnerHTML = date; } window.setinterval ("ShowTime ()", 1000);

Window.moveto (x, y); Window.resizeto (Width,height); Window.scrollto (x, y);

(ii) historical operation Window.history.go (n)

(iii) Address bar operation Window.location.href//Timed Refresh page function showself () {window.location.href= "untitled-3.html";} Window.setinterval ("Showself ()", 1000);

JavaScript Short Summary 1