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Recitation 5
Course: CS 170, Fall 2008School: Rutgers
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Word Count: 405
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5) (Recitation Introduction to JavaScript TA: Wei Chen Email: weichen@cs.rutgers.edu Common mistakes in last assignment <head> and <h1> confused (heading). Only <title> is allowed in <head>. All other content goes in <body>, <title><h1>My page</h1></title> does not work as you might intend....
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5) (Recitation Introduction to JavaScript
TA: Wei Chen Email: weichen@cs.rutgers.edu Common mistakes in last assignment <head> and <h1> confused (heading). Only <title> is allowed in <head>. All other content goes in <body>, <title><h1>My page</h1></title> does not work as you might intend. Tag nesting and missing closing tags <body> Tag redundancy e.g. multiple <body> tags, <h1><b>. Missing quotation marks.
Please go to this URL: http://eden.rutgers.edu/~weichen/cs170/jssample/
Download "Example1.html", start from Example1.html by opening it with Notepad. There are some errors in this file; the corrected version is Example1-Corrected.html.
Basic structure of HTML file with JavaScript code: <html> <head> <title>JavaScript in HTML </title> </head> <body> <script type= "text/javascript"> (JavaScript Code goes here) </script> </body> </html> In JavaScript Each statement ends with semicolon(;) JavaScript is case-sensitive. For example, var a is different from var A Error Console(click "tools" -> "error console") provided by Mozilla Firefox is a good tool for locating errors. Do NOT break lines of Java Script code. It is wrong to use HTML code within a script. It must appear inside a document.write() function. JavaScript Variables Numbers, such as 42 or 3.14159 Logical (Boolean) values, true either or false, e.g. b = (2>1) is equal to b = true;
Strings, always surrounded by double quotes, such as "Howdy!"
a = "123" is different from a = 123!! JavaScript Operators
+ operator When used with numbers, it adds two numbers. When used with strings, it concatenates two strings. Example of Concatenation VS. Addition var a = 123; var b = 123; var c = a + b;
var a = "123" var b = "123" var c = a + b;
c = 246
c = "123123" Three methods in JavaScript
Alert Box SYNTAX : alert ("some text"); Prompt Box SYNTAX: prompt("sometext","defaultvalue"); JavaScript treats all input via the prompt() function as a string. You have to implicitly or explicitly convert to a number by performing an immediate multiplication with the input (e.g. 1*prompt(....)) or use the Number() function. var googles...
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