JavaScript; parsing an IF statement with OR clauses

My question is qu开发者_StackOverflow中文版ite simple, if I declare an IF statement with a series of OR clauses will JavaScript read all of the ORs or stop at the first one that is satisfied?

Thanks in advance.

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Stops at the first one. It's called short-circuiting

http://en.wikipedia.org/wiki/Short-circuit_evaluation https://developer.mozilla.org/en/JavaScript/Reference/Operators/Logical_Operators

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It should only process upto the first OR that returns true:

if (a || b || c) { 

}

If a is false, b is true and c is true, it will process upto b.

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function foo() {
    return true;
}

function bar() {
    alert("bar");
}

foo() || bar(); // true - no alert
bar() || foo(); // true - alert of "bar"

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If the first condition is satisfied, other conditions of or are not evaluated