JavaScript getting started Tutorial: more than one hundred basic knowledge

Source: Internet
Author: User

1.doc ument. write (""); Output statement

2. Comments in JS are //

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

4. the DOM sequence 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. javascript: document. getElementById ("output"). value = document. getElementById ("I

Nput "). value. toUpperCase ();

7. value types in JS: String, Number, Boolean, Null, Object, Function

8. Convert the numeric type in JS to the numeric type: parseInt (), parseFloat ()

9. convert numbers in JS to numeric: ("" + variable)

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

11. The character and character in JS are connected with the + number.

12. The comparison operators in JS include: = equals ,! = Not equal to,>, >=, <. <=

13. Declare variables in. JS using: var for declaration

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

15. loop Structure in JS: for ([initial expression]; [condition]; [upadte expression]) {inside loop}

16. The command for loop abort is break.

17. function Definition in JS: function functionName ([parameter],...)

18. When multiple form forms appear in the file, you can use document. forms [0], document. forms [1] instead.
// Http://www.bkjia.com
19. window: open window. open (), close a window: window. close (), the window itself: self

20. Set the status bar: window. status = "character ";

21. window. alert ("character ");

22. Pop-up confirmation box: window. confirm ();

23. window. prompt ();

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

25. Retrieve 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 for getting the element: document. getElementById ()

30. Set the value of all text members in the form to NULL:

Var form = terraform Doc ument. forms [0]

For (var I = 0; I if (form. elements. type = "text "){

Form. elements. value = "";

}

}

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