Beginner 107 Common JavaScript statements

1.document.write (""); Output statement
The comments in the 2.JS are//
3. 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 of the element in the form"). Name (or value)
6. A lowercase capitalization JS:document.getElementById ("Output"). Value = document.getElementById ("input"). Value.touppercase ();
Value types in 7.JS: string,number,boolean,null,object,function
Conversion of character types in 8.JS to numeric: parseint (), parsefloat ()
The numbers in 9.JS are converted into character types: ( "" variable)
The length of the string in 10.JS is: (length)
The characters in 11.JS are connected to the word typeface.
The comparison operator in 12.JS has: = = equals,! = is not equal to, >=, < <=
Declaring variables in 13.JS using: var for declaration
Decision statement structure in 14.JS: if (condition) {}else{}
Loop structure in 15.JS: for ([Initial expression];[ Condition]; [Upadte expression]) {Inside loop}
16. The Circular abort command is: Break
Functions definition in 17.JS: function functionname ([parameter],...) {Statement[s]}
18. When multiple form forms appear in a file, you can use document.forms[0],document.forms[1] instead.
19. Window: Open Window window.open (), close a window: window.close (), window itself: Self
20. Settings for the window.status=: "character";
21. Popup Message: Window.alert ("character");
22. Popup Confirm Box: Window.confirm ();
23. Popup Input Prompt Box: window.prompt ();
24. Specify the location of the current display link: window.location.href= "URL"
25. Remove the number of all 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. Method of getting elements: document.getElementById ()
30. Set the value of the members of all text types in the form to be 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 select: Document.forms[0].checkthis.checked (Checked property represents whether to check return TRUE or FALSE)
32. Radio button Group (the name of the radio button must be the same): the length of the radio button group Document.forms[0].groupname.length
33. Radio button Group to determine whether or not to be selected is also used checked.
34. The value of the drop-down list box: Document.forms[0].selectname.options[n].value (n sometimes use the drop-down list box name plus. SelectedIndex to confirm the selected value)
35. Definition of the string: var myString = new String ("This is Lightsword");
36. Turn the string into uppercase: String.touppercase (); The string is converted 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. Take a character at the specified position in the string: Stringa.charat (9);
39. Remove the substring that specifies the start and end point in the string: stringa.substring (2,6);
40. Mathematical function: Math.PI (return to PI), Math.sqrt2 (return to root), Math.max (value1,value2) returns the most value in two digits, Math.pow (value1,10) returns value1 10 times, Math.Round (value1) rounding function, Math.floor (Math.random () * (n 1)) returns the number of random machines
41. Define date type variable: var today = new Date ();
42. Date Function List: Dateobj.gettime () Gets the time, dateobj.getyear () Gets the year, Dateobj.getfullyear () gets four bits of the year, Dateobj.getmonth () Gets the month, Dateobj.getdate () Get the day, Dateobj.getday () get the date a few, dateobj.gethours () Get the Hour, dateobj.getminutes () Get points, dateobj.getseconds () Get seconds, Dateobj.settime (value) set time, Dateobj.setyear (Val) set year, Dateobj.setmonth (Val) set month, Dateobj.setdate (Val) Set day, Dateobj.setday (val) sets the day of the week, Dateobj.sethours sets the hour, Dateobj.setminutes (val) sets the Minutes, Dateobj.setseconds (Val) sets the seconds [emphasis: This date time starts from 0]
43.FRAME representation: [window.] Frames[n]. objfuncvarname,frames["FrameName"]. Objfuncvarname,framename.objfuncvarname
44.parent represents the parent object, top represents the topmost object
45. Open the child window's parent window as: opener
46. Indicates the location currently belongs to: this
47. When invoking the JS function in the hyperlink: (JavaScript:) to start with the name of the Add function
48. Do not perform this JS in the old browser: <!--//-->
49. Reference 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 both the hyperlink and the OnClick event are sometimes, the old version of the browser turns to a.html, otherwise turns to b.html. Example: <a href= "a.html" &GT;DFSADF </a >
The 52.JS built-in objects are: Array,boolean,date,error,evalerror,function,math,number,object,rangeerror,referenceerror,regexp, String,syntaxerror,typeerr Or,urierror
Line break 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 in 55.JS represents all 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: such as <p id= "para" > "How is <em >you </em >" </p; then the value of innerHTML is: how is & Lt;em >you </em >
The value of 58.innerTEXT is the same as above, except that <em > is not displayed.
59.contentEditable can set whether the element can be modified, iscontenteditable returns whether it can be modified.
60.isDisabled determines whether it is a prohibited state. Disabled setting the Prohibit state
61.length get length, return integral type 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. In contrast to focus ().
65.select () refers to the element as the selected form.
66. Prevent users from entering text into the text box:
67. Remove the number of occurrences of the element in the page: Document.all.tags ("div (or other HTML label)"). length
There are two forms of output in 68.JS: Modal and non-modal. window.showModalDialog (), window.showmodeless ()
69. The setting of the text of the window.status=: "Text", the default state bar text setting: Window.defaultstatus = ' text. ‘;
70. Add to Favorites: External. Addfavorite ("http://www.dannyg.com";, "Jaskdlf");
Do not do anything when you encounter a script error in 71.JS: Window.onerror = doNothing; The syntax for specifying an error handle is: Window.onerror = handleError;
The parent window of the currently open window is specified in 72.JS: Window.opener, Support Opener.opener ... The multiplicity of continuation.
The self in 73.JS refers to the current window
74.JS Middle Bar display content: window.status= "Content"
Top in 75.JS refers to the topmost frame in the frame set.
Close the current window in 76.JS: Window.close ();
The box that is identified in 77.JS: if (Confirm ("Is you sure?")) {Alert ("OK");} Else{alert ("not OK");}
Window redirection in 78.JS: Window.navigate ("http://www.5icool.org";);
Printed in 79.JS: Window.print ()
Prompt input box in 80.JS: Window.prompt ("message", "defaultreply");
Window scroll bar in 81.JS: Window.Scroll (x, y)
window in 82.JS scroll to position: Window.scrollby
Set time interval in 83.JS: setinterval ("expr", Msecdelay) or setinterval (Funcref,msecdelay) or settimeout
Modal in 84.JS is displayed in 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 you'll stay longer.";}} Window.=verifyclose;
86. File handle used when the form is first called: onload ()
87. File handle called when the form is closed: onunload ()
88.window.location Properties: Protocol (http:), hostname (www.5icool.org), port (+), host (www.5icool.org:80), pathname ("/a/ A.html "), hash (" #giantGizmo ", refers to 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 the page, or using the URL visited)
91.document.write () output with no newline, Document.writeln () line-wrapping output
92.document.body.nowrap=true; Prevent link text from wrapping.
93. Variable name. charAt (the first few), take the character of the variable.
94. "ABC". charCodeAt (the first few), returns the ASCII value of the first few characters.
95. String Connection: String.Concat (string2), or connect with =
96. Variable. IndexOf ("character", starting position), returns the first occurrence of the position (calculated starting from 0)
97.string.lastindexof (Searchstring[,startindex]) The last occurrence of the position.
98.string.match (regexpression) to determine if the character matches.
99.string.replace (regexpression,replacestring) replaces the existing string.
100.string.split (delimiter) returns an array of stored values.
101.string.substr (Start[,length]) takes a string from the first to the specified length.
102.string.tolowercase () turns the string all lowercase.
103.string.touppercase () makes all characters uppercase.
104.parseInt (String[,radix (on behalf of)]) is cast to an integral type.
105.parseFloat (String[,radix]) cast to floating-point type.
106.isNaN (variable): The test is a numeric type.
107. Defining the key word of a constant: const, defining the key word for a variable: var

Beginner 107 Common JavaScript statements