JavaScript DOM编程艺术第2版 英文版.pdf

You don’t need any special software to write JavaScript. All you need is a plain text editor and a web browser. Code written in JavaScript must be executed from a document written in (X)HTML. There are three ways of doing this. You can place the JavaScript between tags within the of the document: Example JavaScript goes here... Mark-up goes here... A much better technique, however, is to place your JavaScript code into a separate file. Save this file with the file extension .js. Traditionally you would include this in the portion of the document by using the src attribute in a tag to point to this file: