js对象或数组深复制

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>深拷贝</title>
</head>
<body>
<script>
    var isArray = function (object) {
        return object && typeof object === 'object' && object.constructor === Array;
    }
    var deepCopy2=function (obj) {
        var result=obj.constructor===Object?{}:[];
        for(key in obj){
            if(!obj.hasOwnProperty(key))continue;//防止遍历原型上的属性
            if( typeof obj[key]==='object'){
                result[key]=deepCopy2(obj[key]);
            }
            else{
                result[key]=obj[key];
            }
        }
        return result;
    };
    var x = {
        a: 1,
        b: ["a","b","c",{"key":"value"}]
    };
    var arr=["a","bb","cc",["wo","shi","haoren"]];
    var arr2=deepCopy2(arr);
    var arr3=deepCopy2(arr);
    arr2[0]="A";
</script>
</body>
</html>