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 number of the element in the form"). Name (or value)
6. A lowercase capitalization js:document.getElementById ("Output"). Value = document.getElementById ("I
Nput "). 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 type: ("" + variable)
The length of the string in 10.JS is: (length)
The characters in 11.JS are connected with the character story using the + sign.
The comparison operators in 12.JS are: = = equals,!= not equal, >,>=,<.<=
13.JS declaring variable use: var to declare
Judgment 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],...)
18. When multiple form forms appear in a file, they can be replaced with document.forms[0],document.forms[1].
Http://www.devdao.com
19. Window: Open Window window.open (), close a window: window.close (), window itself: Self
20. Status bar setting: window.status= "character";
21. Pop-up Message: Window.alert ("character");
22. Pop-up Confirmation 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 if (Form.elements.type = = "Text") {
Form.elements.value = "";
}
}
31. Check the button in JS to determine whether to check: document.forms[0].checkthis.checked (checked property for whether or not selected
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 is sometimes added with a drop-down list box name. sel
Ectedindex to determine 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 two number of the most
At the value, Math.pow (value1,10) returns the value1 10-second square, Math.Round (value1) rounding function, Math.floor (math.ra
Ndom () * (n+1)) returns a 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-bit year, dateobj.getmonth () Gets the month, dateobj.getdate () Gets the day, Dateobj.getday () Gets the date, dat
Eobj.gethours () Gets the Hour, dateobj.getminutes () Gets the score, dateobj.getseconds () Gets the second, Dateobj.setti
Me (value) set time, Dateobj.setyear (Val) set year, Dateobj.setmonth (Val) set month, Dateobj.setdate (VA
L) Set Day, Dateobj.setday (val) set days of the week, Dateobj.sethours set hours, Dateobj.setminutes (Val) set points,
Dateobj.setseconds (val) Set seconds [Note: This date time starts at 0]
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