Javascript Short Introduction By Thanawat Varintree, 49540438
About Javascript Javascript first designed in 1995. Developed by Brendan Eich of Netscape. Design to let programmers control the behavior of software object. Most of web programmer known this well.
Contribution in Programming Language Javascript definition includes extensive facilities for controlling and manipulating parts of web pages such as HTML. For Example (Basic alert box) : <html> <head><title> TITLE </title> <script> alert('HELLO WORLD'); </script> </head> <body></body> </html>
About Javascript(More) More Example that use Javascript - Web stats - Back , Forward , Confirm button (script button) - Header alert - Right click prohibited - web Graphic - etc
About Javascript(More) Javascript is used most widely in Web browsers whose software objects tend to represent a variety of HTML elements in a document and the document itself. Easy for new programmer to learn and use
Example <script> // start javascript // javascript run script --- > top to bottom var a = 1; // global variable a b = 30; // global variable b (same as var b) // var is javascript variable that can store any value // in it (Number , String , Array , Object , etc) var c = a + b; // c = a + b alert('c value is ' + c); // alert c on screen; c++; // c = c + 1 alert(c); // alert c on screen; c = 10; document.write('Hello World!'); // write Hello World
Example //to write a function function proc1 (d){ // procedure method d = a; // local variable d alert ('d * c = ' + d * c) // alert ('a * c') on screen // no return; } proc1(); function proc2(d){ // function method d = 70; return d; // return value alert ('proc2 value = ' + proc2()); //alert return value of proc1()
Example // input output var tex = prompt("plz input some text",""); document.write(tex); </script>