JavaScript Basics >嵌入网页的方式: <script> section in HTML runs on document load 写成一个文件(js),然后用下列方式引入 <script src=url language=javascript"></script> No type declarations undefined if not given a value Global variables by default var makes them localJavaScript Basics ➢ 嵌入网页的方式： ⚫ <script> section in HTML runs on document load ⚫ 写成一个文件（.js)，然后用下列方式引入： • <script src=url language=“javascript”></script> ➢ No type declarations ⚫ undefined if not given a value ➢ Global variables by default ⚫ var makes them local