JavaScript/Notes/Debugging

From Noisebridge
Revision as of 17:25, 30 December 2013 by Garrett (talk | contribs)
Jump to navigation Jump to search

It Doesn't Work!

How to Launch the Debugger

A few approaches:

debugger keyword

<source lang="javascript"> function myFunc(myParam) {

 debugger;
 var myVar = 1;
 
 function innerFunc() {
 
 }

} </source>


debugger from the menu

Debugger.png

Add a Breakpoint

Debugger-breakpoint.png


Debugger Keyword Full Example

Copy'n'paste this example into your text editor, open your browser, and open this file. <source lang="html5"> <!doctype html> <head> <title>Debugger Example</title> <meta http-equiv="Content-Type" content="text/html; charset=utf-8"> </head> <body>

Test Debugger

When Entering an Execution Context, the Variable Environment is initialized with parameter variables, Function Declarations, and Variable Statements.

function myFunc(myParam) {
  debugger;
  var myVar = 1;
  
  function innerFunc() {
  
  }
}

<script> function myFunc(myParam) {

 debugger;
 var myVar = 1;
 
 function innerFunc() {
 
 }

} </script>

Open the debugger and then click the button below.

<button onclick="myFunc(7)">myFunc(7)</button> </body> </html> </source>