js realizes deep copy code sharing

Regarding the implementation of deep copy in js, the first thing to understand is that in order to copy complex objects, the idea of ​​​​recursion is used. The following is a step-by-step implementation and explanation through code.

function deepClone(data1,data2){
        var data2 = data2 || {}; //局部变量data2赋初值为接收的参数或者为一个空对象。
        for(var key in data1){            if(typeof data1[key] === 'object'){ //依次判断data1对象的属性是不是对象
                data2[key] =  (data1[key].constructor===Array) ? [] : {}                //判断要复制的项是对象还是数组
                deepClone(data1[key],data2[key]); //递归实现
            }else {
                data2[key] = data1[key] //如果不是的可以直接相等
            }
        }        return data2;
    }    var json = {"name":"小倪子麻麻","age": "20",arr1:[2,3,4,5]};    var json1 = {};
    json1 = deepClone (json,json1);
    json.arr1.pop();
    console.log(json); //{"name":"小倪子麻麻","age": "20",arr1:[2,3,4]};
    console.log(json1);//{"name":"小倪子麻麻","age": "20",arr1:[2,3,4,5]};

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