Javascript Study Notes: Debugging and Optimization

1. Errors and exceptions: Common Errors: spelling errors, nonexistent access variables, mismatched brackets, connection errors, equal signs, and assignments ..

2. Error Handling: onerror event. Window. onerror = function fnerror () {alert ("error") ;}; try {..} Catch (exception) {for (var str in exception) {var SS + = STR + "\ n "}}

3. Debugger: Microsoft Script debugger debugging tool for IE. Venkman is a debugging tool for Firefox. It is very useful to debug large JavaScript Functions.

4. Javascript optimization: download time, use built-in functions, and minimize the number of statements.