javascript深度克隆函数deepClone

javascript深度克隆函数deepClone

 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);