简单对象的Javascript内存泄漏

Question

I am looking for some very basic examples of memory leaks in JavaScript and how to fix them. Specifically, if I do something like this in my code;

var obj = new MyObj();

Do I have to take care of something or do some steps explicitly so that obj does not leak? Or do I not have to worry about anything? Will it get garbage collected automatically by the browser ?

Are there any cross-browser differences in how memory handling is done (wrt DOM or any other objects) ?

Answer 1

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Answer 2

A short summary: Objects will be garbage collected by the browser automatically when the object has no more references to it.

So doing

var obj = {}; obj = null;

will cause obj to be garbage collected at same random point in the future, you can not explicitly tell the browser to garbage collect this object. Off course this is something you will usually not be doing, since object references usually go out of scope.

Example:

function foo() {
 var obj = {};
}
foo();

After this function call, the obj variable doesn't exist anymore and goes out of scope, the object that was being referenced by obj is now a candidate to be garbage collected.