Học JavaScript qua ví dụ part 10 pps
Học JavaScript qua ví dụ part 10 pps
...
</body>
</html>
EXPLANATION
1 The <script> tag starts the JavaScript program. The JavaScript engine starts exe-
cuting code from here until the closing </script> tag. JavaScript does not under-
stand HTML ... (right).
EXAMPLE 4.2
<html>
<head>
<title>Using JavaScript alert box</title>
1 <script type="text /javascript& quot;>...
Học JavaScript qua ví dụ part 3 pps
... Fresco on RISC OS also support JavaScript.
Figure 1 .10 JavaScript2 and the Web, an informative paper by Brendan Eich.
Table 1.3 JavaScript Versions (continued)
JavaScript or
JScript Version Browsers ... state of the JavaScript language and the obstacles faced in
trying to change it. See Figure 1 .10.
1 .10. 2 Does Your Browser Follow the Standard?
Modern browsers are using versio...
Học JavaScript qua ví dụ part 8 ppsx
... but JavaScript is loosely
typed. It doesn’t expect or allow you to specify the data type when declaring a variable.
You can assign a string to a variable and later assign a numeric value. JavaScript ... runtime, the JavaScript interpreter will convert the data to the correct type.
Consider the following variable, initialized to the floating-point value of 5.5. In each suc-
cessive st...
Học JavaScript qua ví dụ part 19 pps
... value?
8. Did you define and call the function from within a JavaScript program?
Figure 7.17 shows function errors displayed by the JavaScript Error Console in
Firefox. This is a very useful ... button, rolling a
mouse over an image, or submitting a form. Functions will be defined within JavaScript
code or from another file. They may be used to create objects, respond to HTTP reques...
Học JavaScript qua ví dụ part 20 pps
... cup or a hat as an object. JavaScript can represent data
such as a string or a number as an object, and JavaScript lets you create your own
objects. When talking about JavaScript data types in ... Properties are not variables. Do not use
the var keyword.
4 This is the end of the JavaScript program.
5 A new JavaScript program starts here in the body of the page.
6 The global objec...
Học JavaScript qua ví dụ part 21 pps
...
</script>
</head>
<body>
<script type = "text /javascript& quot;>
7 var myBook = new Book(" ;JavaScript by Example",
"Ellie Quigley", "Prentice ... User-Defined Functions
8.2.1 What Is a Class?
JavaScript ain’t got no class! If you are familiar with Java or C++ you may be wondering
how to create a class in JavaScript. A class is a t...
Học JavaScript qua ví dụ part 25 ppsx
... = new Array (10) ;
var array2 = [ 10 ];
The first array is specified to be a 10- element array. The second array is initialized
with the value of the first element being the number 10.
EXPLANATION
1 ... WoweBook.Com
ptg
213
chapter
9
JavaScript
Core Objects
9.1 What Are Core Objects?
Like an apple, JavaScript has a core, and at its core are objects. Everything you do in
JavaScrip...
Học JavaScript qua ví dụ part 28 pps
...
Math.Log10E 0.4342944819032518167 Log base -10 of E
Math.PI 3.14592653589793116 Pi, ratio of the circumference of a
circle to its diameter
Math.SQRT1_2 0.70 7106 7811865475727 1 divided by the square ...
10, achieved by multiplying the return value of the random number by 10 and
then using the floor() method to round down the number to produce a whole
number. This will produce 0 but n...
Học JavaScript qua ví dụ part 32 pps
... (see Examples 10. 10, 10. 11, and 10. 13).
setTimeout(function, milliseconds, [arguments]) After a timeout period has elapsed, evaluates a
function (see Examples 10. 10, 10. 11, and 10. 13).
FORMAT
var ... expression
(see Examples 10. 10 and 10. 12).
setInterval(function, milliseconds, [arguments]) After a specified interval, evaluates a function (see
Examples 10. 10 and 10. 12...
Học JavaScript qua ví dụ part 39 pps
... window object, which is fine because JavaScript knows
that the window is always at the top of the tree. See Figure 11.13.
10 Although this chapter focuses on the JavaScript legacy DOM 0 when working ... name in square brackets, it is easier to identify the object as a form object by
name if there are a number of forms on the page.
9 To display the name of the second form, descend the...