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    <p>When you call "apply" on a function, the function object itself is the "this" of the call to "apply", so you can do this:</p> <pre><code>function test(s) { alert(""+s); } Function.prototype.apply.call(setTimeout, null, [test, 0, 'abc']); // Note: same as "setTimeout.apply(null, [test, 0, 'abc']);" in supported browsers. </code></pre> <p>Basically, we are forcing the use of <code>Function.prototype.apply</code> instead of trying to look for a non-existing <code>setTimeout.apply</code>. In the parameters to <code>call</code>, the first argument is the function we want to run using <code>apply</code> (the object context, which is <code>setTimeout</code> in this case). What follows next are the parameters that get pass to <code>apply</code>, the first of which is the expect <code>this</code> the function will be run under ('null' in this case, since <code>setTimeout</code> does not allow a <code>this</code> context value), and the following being the array of arguments to be passed to the function we want to run.</p> <p>This works in IE7+, except IE7 doesn't pass on the custom parameters (i.e 'abc' in this example, which will prompt "undefined" instead).</p> <p>Here's a TypeScript implementation:</p> <pre><code>/** Helps support cases where 'apply' is missing for a host function object (i.e. IE7 'setTimeout', etc.). This function * will attempt to call '.apply()' on the specified function, and fall back to a work around if missing. * @param {Function} func The function to call '.apply()' on. * @param {Object} _this The calling object, which is the 'this' reference in the called function (the 'func' argument). * Note: This must be null for special host functions, such as 'setTimeout' in IE7. * @param {any} args The arguments to apply to given function reference (the 'func' argument). */ function apply(func: Function, _this: Object, args: any[]): any { if (func.apply) { return func.apply(_this, args); } else { return Function.prototype.apply.call(func, _this, args); } } </code></pre> <p>... and a basic JavaScript one:</p> <pre><code>function apply(func, _this, args) { if (func.apply) { return func.apply(_this, args); } else { return Function.prototype.apply.call(func, _this, args); } } </code></pre>
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    1. POInternet Explorer 7/8 and window functions are empty objects
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    1. USJames Wilkins
    1. USJames Wilkins
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