Học JavaScript qua ví dụ part 21 pps
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...
Ngày tải lên: 04/07/2014, 02:20
Học JavaScript qua ví dụ part 3 pps
... Chapter 1 • Introduction to JavaScript So where is JavaScript now? As of December 2009, the ECMA-262 Standard is in its 5th edition. JavaScript is a dialect of ECMAScript, but JavaScript 1.8 is comparable ... JScript 5.5, 5.6, 5.7, 6 JavaScript 1.6 2006 Mozilla Firefox, Safari JavaScript 1.7 2006 Mozilla Firefox, Safari, Google Chrome JavaScript 1.8 2008 Mozilla Firefox JavaSc...
Ngày tải lên: 04/07/2014, 02:20
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...
Ngày tải lên: 04/07/2014, 02:20
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;>...
Ngày tải lên: 04/07/2014, 02:20
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 ... file (server-side JavaScript allows you to access files). If an exception is thrown while the file is open, the finally clause closes the file before the script fails. Figure 7 .21 An erro...
Ngày tải lên: 04/07/2014, 02:20
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...
Ngày tải lên: 04/07/2014, 02:20
Học JavaScript qua ví dụ part 25 ppsx
... of 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 JavaScript will be ... create your own as we did in Chapter 8, “Objects,” or use JavaScript s core objects. Core objects are built right into the language. JavaScript provides built-in objects that deal with t...
Ngày tải lên: 04/07/2014, 02:20
Học JavaScript qua ví dụ part 28 pps
... up only if the decimal part of the number is 5 or higher (see Figure 9.25). Figure 9.25 Output from Example 9 .21. From the Library of WoweBook.Com ptg 242 Chapter 9 • JavaScript Core Objects Math.LOG2E ... circle to its diameter Math.SQRT1_2 0.7071067811865475727 1 divided by the square root of 2 Math.SQRT2 1.41 4213 562373985145 Square root of 2 Table 9.6 Math Object Methods Method...
Ngày tải lên: 04/07/2014, 02:20
Học JavaScript qua ví dụ part 32 pps
... href> tag is assigned name of a JavaScript function. The JavaScript: label allows the function to be called when the user clicks the link. Without the JavaScript: label, the browser will ... What It Describes From the Library of WoweBook.Com ptg 10.1 JavaScript and the Browser Object Model 291 Moving and Resizing a Window. JavaScript provides several methods with which to resiz...
Ngày tải lên: 04/07/2014, 02:20
Học JavaScript qua ví dụ part 39 pps
... the Library of WoweBook.Com ptg 11.4 JavaScript and the form Object 353 The elements and properties of the HTML <form> tag are shown in Table 11.8. How JavaScript References the Form Elements ... 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 Jav...
Ngày tải lên: 04/07/2014, 02:20