What are the common built-in objects in JavaScript-JS Tutorial-php.cn

What are the common built-in objects in JavaScript

王林

Release： 2023-01-07 11:42:21

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Common built-in objects in JavaScript include Array objects, Math objects, Date objects and String objects. Built-in objects refer to the objects that come with JavaScript itself.

What are the common built-in objects in JavaScript

#The operating environment of this article: windows10 system, javascript 1.8.5, thinkpad t480 computer.

The built-in objects in JavaScript actually refer to the objects that come with JavaScript itself and provide some commonly used functions.

There are four common built-in objects, namely:

Array object: Provides an array model to store a large amount of ordered data.

Math object: can handle all mathematical operations.

Date object: can handle the storage, conversion and expression of date and time.

String object: can handle all string operations.

Mathematical object code example:

<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8">
    <title></title>
</head>
<body>
    <script>
        console.log(Math);
        console.log(Math.PI);//输出为π
        console.log(Math.floor(1.9));//向下取整
        console.log(Math.ceil(1.1));//向上取整
        console.log(Math.round(4.3));//四舍五入
        console.log(Math.abs(-33));//取绝对值
        console.log(Math.max(1, 2, 3, 4, 5));//取最大值
        console.log(Math.max.apply(null, [1, 2, 3, 4, 5]));//null表示this指针不替换
        console.log(Math.min(1, 2, 3, 4, 5));//取最小值
        console.log(Math.min.apply(null, [1, 2, 3, 4, 5]));
        console.log(Math.sqrt(100));//开平方
        console.log(Math.pow(5, 3));//幂，5的3次方
        console.log(Math.sin(90 * Math.PI / 180));//正弦，弧度=角度*π/180
        console.log(Math.cos(180 * Math.PI / 180));//余弦
        console.log(Math.tan(90 * Math.PI / 180));//正切
    </script>
</body>
</html>

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