function deepClone(obj) {    var _toString = Object.prototype.toString;    // null, undefined, non-object, function    if (!obj || typeof obj !== ‘object‘) {        return obj;    }    // DOM Node    if (obj.nodeType && ‘cloneNode‘ in obj) {        return obj.cloneNode(true);    }    // Date    if (_toString.call(obj) === ‘[object Date]‘) {        return new Date(obj.getTime());    }    // RegExp    if (_toString.call(obj) === ‘[object RegExp]‘) {        var flags = [];        if (obj.global) { flags.push(‘g‘); }        if (obj.multiline) { flags.push(‘m‘); }        if (obj.ignoreCase) { flags.push(‘i‘); }        return new RegExp(obj.source, flags.join(‘‘));    }    var result = Array.isArray(obj) ? [] :        obj.constructor ? new obj.constructor() : {};    for (var key in obj ) {        result[key] = deepClone(obj[key]);    }    return result;}function A() {    this.a = a;}var a = {    name: ‘qiu‘,    birth: new Date(),    pattern: /qiu/gim,    container: document.body,    hobbys: [‘book‘, new Date(), /aaa/gim, 111]};var c = new A();var b = deepClone(c);console.log(c.a === b.a);console.log(c, b);

编写 javascript 深度克隆函数 deepClone