COIS 3420H Lecture Notes - Lecture 7: Content Delivery Network, Javascript, Jquery
6 Mar 2019
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Document Summary
It should be easy to implement ; typically, a web developer has only to include the script itself and add a javascript hook in the document, and the script works. ***do not add embedded javascript within an html document. *** always do javascript in a separate file. Is a geographically distributed network of proxy servers and their data centers. The goal is to provide high availability and high performance. If the cdn fails, there must be a fallback for jquery. Javascript errors are never displayed on the webpage. **look in the console tab in the developers tools to view errors in javascript. Debugging javascript: one syntax error typically stop the entire script from working. The core : same things: comments : // and /, semi-colon statement termination , code blocks {, case-sensitivity, conditionals : if, else if, else , switch, case. Javascript variables are loosely typed: note: use strict at the top of your javascript file enforeces variables declarations.
