debug.js会把调试信息显示在网页上，很方便的就能看到。原理也十分简单，动态创建dom元素，然后append到页面中。-The debug. Js will display the debugging information on the web page, very convenient to see.Create dom elements principle is also very simple, dynamic, then append to the page.

电话本管理系统的主程序，调用程序以及调试结果-The main telephone management system, the calling program and debug the results