How to do JavaScript object introspection?

问题

What to do when after all probing, a reportedly valid object return 'undefined' for any attribute probed? I use jQuery, $('selector').mouseover(function() { }); Everything returns 'undefined' for $(this) inside the function scope. The selector is a 'area' for a map tag and I'm looking for its parent attributes.

回答1:

Your question is a bit vague, so maybe you can provide more details?

As for finding out about an object and the values of its properties, there are many ways to do it, including using Firebug or some other debug tools, etc. Here is a quick and dirty function that might help get you started until you can provide more details:

function listProperties(obj) {
   var propList = "";
   for(var propName in obj) {
      if(typeof(obj[propName]) != "undefined") {
         propList += (propName + ", ");
      }
   }
   alert(propList);
}

That will display a list of the properties of the object that you pass it that are not undefined.

Hope that helps...

回答2:

Is selector the name of the element? If so then you should reference it as:

$('area#selector')

or

$('#selector')

otherwise it will attempt to look for the (non-existent) "selector" HTML tag and, obviously, not find it.

回答3:

Though this answer is a bit late, I'd still recommend checking out these links:

http://www.webweavertech.com/ovidiu/weblog/archives/000317.html
http://www.syger.it/Tutorials/JavaScriptIntrospector.html

来源：https://stackoverflow.com/questions/328382/how-to-do-javascript-object-introspection