Finding Analysis Errors in Javascript

Question

Is there an easy way to find parsing errors in javascript code?

Last week, I debugged a javascript problem when the first javascript function that was called gave the "expected object" error. Later, I decided that this was because the browser was unable to parse the javascript code. In the end, I solved the problem, but it was a painful process that included my code line by line, trying to find my error.

There should be an easier way.

Answer 1

Use a tool like Jslint or an alternative browser.

IE , . ) , , ) , .

" " IE Opera. IE, .

:

var foo = {
  prop1 : 'value',
  prop2 : 'value',
  prop2 : 'value',   // <-- the problem
};

: IE6 IE7 , IE . , . , ( ) . Firefox Safari . Opera , ( ).

JavaScript - Firefox + Firebug. IE Opera , , .

Answer 2

? IE8 javascript, Firefox, Firebug .

Answer 3

• , , , .

• Safari 4 (which runs on both Mac OS X and Windows) comes with some development tools (including a debugger) that are very useful. If you prefer to use Firefox, Firebug provides similar functionality.

• JSLint can help you track simple errors.

Steve