handwriting-algorithm/10shallowCopy.html at master · ustcfury/handwriting-algorithm · GitHub

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<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>

<body>
    <script>
        // 浅拷贝的实现;

        function shallowCopy(object) {
            // 只拷贝对象
            if (!object || typeof object !== "object") return;

            // 根据 object 的类型判断是新建一个数组还是对象
            let newObject = Array.isArray(object) ? [] : {};

            // 遍历 object，并且判断是 object 的属性才拷贝
            for (let key in object) {
                if (object.hasOwnProperty(key)) {
                    newObject[key] = object[key];
                }
            }

            return newObject;
        }
    </script>
</body>

</html>