• 코드:
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<!DOCTYPE html>
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<html lang="ko">
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​
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<head>
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    <meta charset="UTF-8">
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    <title>JavaScript Number Method</title>
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</head>
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​
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<body>
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​
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    <h1>toPrecision() 메소드</h1>
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​
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    <script>
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        var num = 3.14159265; // Number 인스턴스를 생성함.
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​
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        document.write(num.toPrecision() + "<br>");         // 3.14159265
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        document.write(num.toPrecision(2) + "<br>");        // 3.1
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        document.write(num.toPrecision(4) + "<br>");        // 3.142
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        document.write(3.14159265.toPrecision(6));          // 3.14159
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    </script>
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</body>
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​
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</html>