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    <p>The simplest way would be to use the native <code>Number</code> function:</p> <pre><code>var x = Number("1000") </code></pre> <p>If that doesn't work for you, then there are the <strong>parseInt</strong>, <strong>unary plus</strong>, <strong>parseFloat with floor</strong>, and <strong>Math.round</strong> methods.</p> <p>parseInt:</p> <pre><code>var x = parseInt("1000", 10); // you want to use radix 10 // so you get a decimal number even with a leading 0 and an old browser ([IE8, Firefox 20, Chrome 22 and older][1]) </code></pre> <p>unary plus if your string is already in the form of an integer:</p> <pre><code>var x = +"1000"; </code></pre> <p>if your string is or might be a float and you want an integer:</p> <pre><code>var x = Math.floor("1000.01"); //floor automatically converts string to number </code></pre> <p>or, if you're going to be using Math.floor several times:</p> <pre><code>var floor = Math.floor; var x = floor("1000.01"); </code></pre> <p>If you're the type who forgets to put the radix in when you call parseInt, you can use parseFloat and round it however you like. Here I use floor.</p> <pre><code>var floor = Math.floor; var x = floor(parseFloat("1000.01")); </code></pre> <p>Interestingly, Math.round (like Math.floor) will do a string to number conversion, so if you want the number rounded (or if you have an integer in the string), this is a great way, maybe my favorite:</p> <pre><code>var round = Math.round; var x = round("1000"); //equivalent to round("1000",0) </code></pre>
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    1. POHow do I convert a string into an integer in JavaScript?
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    1. POHow do I convert a string into an integer in JavaScript?
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    1. COFor the last case, if you just want to truncate the number (round toward zero) you can still use parseInt. It will parse the number up to the period.
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      1. USMatthew Crumley
    2. COYes. Any time I'm using "floor" much I do var floor=Math.floor which tightens things up a bit. I just wanted to show what happens with unary plus when you have a float. People run into trouble all the time because 1) People end up with strings when they want numbers. 2) JavaScript uses "+" for both addition and string concatenation.
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    3. COWhat is the `valueOf` for? For strings it returns the string itself.
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