lovecoding
/
W250913


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

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>

<body>
    <script>
        // 深拷贝 递归拷贝
        function deepClone(val) {
            // 如果传递过来的是一个基本数据类型 直接返回
            if (typeof val != "object" || val === null) {
                return val;
            } else {
                if (Array.isArray(val)) {
                    let newArr = [];
                    for (let i = 0; i < val.length; i++) {
                        newArr[i] = deepClone(val[i]);
                    }
                    return newArr;
                } else {
                    let newObj = {};
                    for (let key in val) {
                        newObj[key] = deepClone(val[key]);
                    }
                    return newObj;
                }
            }
        }

        let arr = [1, 2, ["a", "b"], 3, 4];
        let obj = {
            a: 1,
            b: 2,
            c: {
                x: 100,
                y: 200
            }
        }
        let obj2 = deepClone(obj);
        obj.c.x = 300;
        console.log(obj2);

        // let arr2 = deepClone(arr);
        // arr[0] = 100;
        // arr[2][0] = "hello";
        // console.log(arr2);
    </script>
</body>

</html>