lovecoding
/
web0715


			
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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>
        // var arr = [1,2,3,['a','b']];
        // // 扩展运算符只能实现浅拷贝
        // var arr2 = [...arr];
        // arr[0] = "hello";
        // arr[3][0] = "world";
        // console.log(arr2);


        // var arr = [1,2,3,['a','b','c']];
        // var arr2 = arr;
        // arr[0] = "hello";
        // console.log(arr2);


        var arr = [1,2,3,['a','b','c']];
        var obj1 = {
            a:1,
            b:2,
            c:{
                str:"hello",
                num:10
            }
        }

        // for(let item in obj){
        //     console.log(obj[item]);
        // }

        // var objName = 'a';
        // console.log(obj[objName]);
        // console.log(typeof arr,typeof obj);
        // console.log(Array.isArray(arr));
        function deepClone(obj){
            var res = null
            if(typeof obj == "object"){
                if(Array.isArray(obj)){
                    res = [];
                    for(let val of obj){
                        res.push(deepClone(val))
                    }
                }else{
                    res = {};
                    for(let val in obj){
                        res[val] = deepClone(obj[val])
                    }
                }
            }else{
                res = obj
            }

            return res
        }

        var newArr = deepClone(arr);
        // arr[0] = "hello";
        // arr[3][0] = "world";
        // console.log(arr,newArr)
        var newObj = deepClone(obj1);
        // obj1.a = "hello";
        // obj1.c.num = 1000;
        // console.log(obj1,newObj)


    </script>
</body>
</html>