If you have a web browser and any text editor, you have everything you need to run JavaScript programs. First, make an HTML file with a name like program.html:
<html><body><pre><script src="program.js"> </script></pre></body></html>
Then, make a file in the same directory with a name like program.js:
document.writeln('Hello, world!'),Next, open your HTML file in your browser to see the result. Throughout the book,
a method method is used to define new methods.
This is its definition:
Function.prototype.method = function (name, func) {
this.prototype[name] = func;
return this;
};It will be explained in Chapter 4.
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