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    <p>Read about Scopes in JavaScript for example in "Java Script: The good parts".</p> <p>In the Java Script there is only scope inside Functions. If you specify your variable inside function with <strong>var</strong> you can't access them from outside of this function. This is way to make private variables in JavaScript.</p> <p>You can use <strong>this</strong> variable, that point to current object you are in (this is not a scope itself). But! if you initiate function without <strong>new</strong> command, than <strong>this</strong> will point to outer scope (in most cases it's window object = global scope).</p> <p>Example:</p> <pre><code>function foo(){ var a = 10; } var f = foo(); //there is nothing in f var f = new foo(); //there is nothing in f function bar(){ this.a = 10; } var b = new bar(); //b.a == 10 var b = bar(); //b.a == undefined, but a in global scope </code></pre> <p>Btw, check out syntax of apply method <a href="https://developer.mozilla.org/en/Core_JavaScript_1.5_Reference/Global_Objects/Function/apply" rel="nofollow noreferrer">Mozilla docs/apply</a> So you can see, that fist argument is object, that will be <strong>this</strong> when your method will be called.</p> <p>So consider this example:</p> <pre><code>function bar(){ console.log(this.a); console.log(this.innerMethod(10)); } function foo(){ this.a = 10; this.innerMethod = function(a){ return a+10; } bar.apply(this); } var f = new foo(); // =&gt; you will get 10 and 20 in the console. var f = foo(); // =&gt; you will still get 10 and 20 in the console. But in this case, your "this" variable //will be just a global object (window) </code></pre> <p>Maybe it's better to make </p> <pre><code>var that = this; </code></pre> <p>before calling apply method, but maybe it's not needed. not sure</p> <p>So, this definitely will work:</p> <pre><code>function foo(){ console.log(this.a); } jQuery.extend({ somefunc: function(func){ this.a = 10; func.apply(this); } }); $.somefunc(foo); //will print 10. </code></pre>
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