Học JavaScript qua ví dụ part 39 pps
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
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...
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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;>...
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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...
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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 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...
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Học JavaScript qua ví dụ part 25 ppsx
... 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 based ... 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...
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Học JavaScript qua ví dụ part 28 pps
... circle to its diameter Math.SQRT1_2 0.7071067811865475727 1 divided by the square root of 2 Math.SQRT2 1.4142135623 7398 5145 Square root of 2 Table 9.6 Math Object Methods Method Functionality Math.abs(Number) ... 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 • JavaSc...
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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