JavaScript usage Tips Daquan

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

The annotation in 2.JS is//

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].

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 ();