Common statements in JS in website development

1.document.write (""); Output statement

The annotation in 2.JS is//

3. The traditional HTML document order is: document->html-> (head,body)

4. The DOM order in a browser window is: window-> (navigator,screen,history,location,document)

5. Get the name and value of the element in the form: document.getElementById ("ID number of elements in the form"). Name (or value)

6. A lowercase capitalization JS:document.getElementById ("Output"). Value = document.getElementById ("input"). Value.touppercase ();

Value type in 7.JS: string,number,boolean,null,object,function

The character type in 8.JS converts to a numeric type: parseint (), parsefloat ()

Converts numbers in 9.JS to character types: ( "" variable)

The length of the string in 10.JS is: (length)

The characters in 11.JS are connected with the character story.

The comparison operators in 12.JS are: = = equals,!= is not equal to, >=,. <=

13.JS declaring variable use: var to declare

Decision statement structure in 14.JS: if (condition) {}else{}

Loop structure in 15.JS: for ([Initial expression];[ Condition]; [Upadte expression]) {Inside loop}

16. The order of the circular abort is: break

function definition in 17.JS: function functionname ([parameter],...) {Statement[s]}

18. When multiple form forms appear in a file, they can be replaced with document.forms[0],document.forms[1].

19. Window: Open Window window.open (), close a window: window.close (), window itself: Self

20. The setting of the form column: window.status= "character";

21. Pop-up Message: Window.alert ("character");

22. Pop-up Confirm box: Window.confirm ();

23. Pop-up Input Prompt box: window.prompt ();

24. Specify the location of the currently displayed link: window.location.href= "URL"

25. Remove the number of forms in the form: document.forms.length

26. Close the output stream of the document: Document.close ();

27. String Append connector: =

28. Create a document element: Document.createelement (), document.createTextNode ()

29. Methods of obtaining elements: document.getElementById ()

30. Set the value of all text types in the form to null:

var form = Window.document.forms[0]

for (var i = 0; I <form.elements.length;i) {

if (Form.elements.type = = "Text") {

Form.elements.value = "";

}

}

31. Check the button in JS to determine whether to check: document.forms[0].checkthis.checked (The Checked property represents whether checked returns true or false)

32. Radio button Group (the name of the radio button must be the same): the length of a radio button group Document.forms[0].groupname.length

33. Radio button Group to determine whether the selected is also used checked.

34. Value of the Drop-down list box: Document.forms[0].selectname.options[n].value (n sometimes with a drop-down list box name plus. SelectedIndex to make sure the selected value)

35. Definition of string: var myString = new String ("This is Lightsword");

36. String to uppercase: String.touppercase (); The string is turned to lowercase: string.tolowercase ();

37. Returns the position where string 2 appears in string 1: String1.indexof ("String2")!=-1 the description was not found.

38. Takes a character at a specified position in the string: Stringa.charat (9);

39. Remove the substring from the specified start and end point in the string: stringa.substring (2,6);

40. Mathematical function: Math.PI (return pi), Math.sqrt2 (return to the root), Math.max (value1,value2) returns the most value in the two number, Math.pow (value1,10) return

10 value1, Math.Round (value1) rounding function, Math.floor (Math.random () * (n 1)) returns random number

41. Define date variables: var today = new Date ();

42. Date Function List: Dateobj.gettime () Get Time, dateobj.getyear () Get the Year, Dateobj.getfullyear () get four-digit year, Dateobj.getmonth ()

To the month, Dateobj.getdate () Gets the day, Dateobj.getday () Gets the date, dateobj.gethours () Gets the Hour, dateobj.getminutes () gets

Minutes, dateobj.getseconds () Get seconds, dateobj.settime (value) set time, Dateobj.setyear (Val) set year, Dateobj.setmonth (val) settings

Month, Dateobj.setdate (Val) Set day, Dateobj.setday (val) set days of the week, Dateobj.sethours set hours, Dateobj.setminutes (val) settings

Min, Dateobj.setseconds (val) Set seconds [Focus: This date time starts at 0]

43.FRAME representation: [window.] Frames[n]. objfuncvarname,frames["FrameName"]. Objfuncvarname,framename.objfuncvarname

44.parent represents the Father object, top represents the topmost object

45. Open child window's parent window is: opener

46. Represents the current location: this

47. When calling the JS function in a hyperlink: (JavaScript:) to start with the following function name

48. Do not execute this JS in the old browser: ><!--//-->

49. Refer to a file-style JS: <script type= "Text/javascript" src= "Aaa.js" > </script >

50. Specify HTML to display in browsers that do not support scripting: <noscript > </noscript >

51. When the chain and onclick events are sometimes, the old version of the browser turned to a.html, otherwise turn to b.html. Example: DFSADF

52.JS of built-in objects

There are: array,boolean,date,error,evalerror,function,math,number,object,rangeerror,referenceerror,regexp,string, Syntaxerror,typeerr

Or,urierror

Line wrapping in 53.JS: \ n

54. Window Full Screen size: <script >function fullscreen () {This.moveto

(0,0); this.outerwidth=screen.availwidth;this.outerheight=screen.availheight;} Window.maximize=fullscreen; </script >

All of the 55.JS represents all the elements of its lower layer

Focus order in 56.JS: document.getElementById ("form Element"). TabIndex = 1

The value of 57.innerHTML is the value of the form element:

"How are"

, the value of innerHTML is: How to Are You

The value of 2 58.innerTEXT is the same as the above, but it does not show the mark.

59.contentEditable can set whether the element can be modified, iscontenteditable returns whether it can be modified.

60.isDisabled Determine whether it is a prohibited state. Disabled set a ban on the form

61.length get length, return integer value

62.addBehavior () is a JS called external function file whose extension is. htc

63.window.focus () causes the current window to precede all windows.

64.blur () refers to the loss of focus.

65.select () refers to the element as a checked form.

66. Prevent users from entering text in the text box:

67. Remove the number of occurrences of the element in the page: Document.all.tags ("div (or other HTML tag)"). length

There are two forms of output in 68.JS: Modal and non-modal. window.showModalDialog (), window.showmodeless ()

69. Settings for the text of the form bar: window.status= ' text ', default text settings for the form bar: window.defaultstatus = ' text. ';

70. Add to Favorites: External. Addfavorite ("http://www.dannyg.com";, "Jaskdlf");

71.JS encountered a script error without any action: Window.onerror = donothing; The syntax for the specified error handle is: Window.onerror = HandleError;

72.JS Specifies the parent window for the currently open window: Window.opener, support Opener.opener ... The multiplicity continues.

Self in 73.JS refers to the current window

74.JS Medium Status column display content: window.status= "Contents"

Top in 75.JS refers to the topmost frame in the frameset

Close the current window in 76.JS: Window.close ();

77.JS box to be identified: if (Confirm ("Are you sure?") {Alert ("OK");} Else{alert ("not OK");}

Window redirection in 78.JS: Window.navigate ("http://www.sina.com.cn";);

Printing in 79.JS: Window.print ()

80.JS prompt input box: window.prompt ("message", "defaultreply");

Window scroll bar in 81.JS: Window.Scroll (x,y)

The window in 82.JS scrolls to position: Window.scrollby

Set time interval in 83.JS: setinterval ("expr", Msecdelay) or setinterval (Funcref,msecdelay) or settimeout

The mode in the 84.JS is displayed in the IE4 line, not in nn: ShowModalDialog ("URL" [, Arguments][,features]);

Handle used before exiting in 85.JS: function Verifyclose () {event.returnvalue= "We really like you and hope your'll stay longer."}

Window.=verifyclose;

86. File handle to use when the form is first called: onload ()

87. File handle to call when form closes: OnUnload ()

88.window.location Properties: Protocol (http:), hostname (www.example.com), port (+), host (www.example.com:80), pathname

("/a/a.html"), hash ("#giantGizmo", meaning jump to the corresponding anchor), href (All information)

89.window.location.reload () refreshes the current page.

90.window.history.back () returns to the previous page, Window.history.forward () returns to the next page, Window.history.go (returns to page, or uses the visited URL)

91.document.write () No line-wrapping output, Document.writeln () line-wrapping output

92.document.body.nowrap=true prevents link text from wrapping.

93. Variable name. CharAt (ordinal), take the first few characters of the variable.

The "ABC". charCodeAt (ordinal number) returns the ASCII value of the first few characters.

95. String Connection: String.Concat (string2), or connect with =

96. Variable