function deepclone(obj){
        let result;
        switch(typeof obj){
            case 'undefined':
            break;
            case 'object':
                if (obj === null) {
                    result = null
                } else if (Object.prototype.toString.call(obj) === '[object Array]') {
                    result = []
                    obj.map(item => result.push(deepclone(item)))
                } else {
                    result = {};
                    for (var k in obj) {
                        result[k] = deepclone(obj[k])
                    }
                }
                break;
            default:
                result = obj;
                break
        }
        return result
    }
    arr = [
        {name: 'xiaoming', age: 18},
        false,
        18,
        null,
        undefined,
        [1, 2, 3, 4]
    ]
    let cloneArr = deepclone(arr);
    console.log(cloneArr);
    cloneArr[0].name = 'xiaohong';
    cloneArr[1] = 'xixixi';
    console.log(arr)
    console.log(cloneArr)

运行结果：

运行结果.png