JS-实用方法整理

    function deepClone(obj) {
        if (obj == null || typeof obj !== ‘object‘) {
            return obj;
        }
        switch (Object.prototype.toString.call(obj)) {
            case ‘[object Array]‘:
                {
                    var result = new Array(obj.length);
                    for (var i = 0; i < result.length; ++i) {
                        result[i] = deepClone(obj[i]);
                    }
                    return result;
                }

            case ‘[object Error]‘:
                {
                    var result = new obj.constructor(obj.message);
                    result.stack = obj.stack; // hack...
                    return result;
                }

            case ‘[object Date]‘:
            case ‘[object RegExp]‘:
            case ‘[object Int8Array]‘:
            case ‘[object Uint8Array]‘:
            case ‘[object Uint8ClampedArray]‘:
            case ‘[object Int16Array]‘:
            case ‘[object Uint16Array]‘:
            case ‘[object Int32Array]‘:
            case ‘[object Uint32Array]‘:
            case ‘[object Float32Array]‘:
            case ‘[object Float64Array]‘:
            case ‘[object Map]‘:
            case ‘[object Set]‘:
                return new obj.constructor(obj);

            case ‘[object Object]‘:
                {
                    var keys = Object.keys(obj);
                    var result = {};
                    for (var i = 0; i < keys.length; ++i) {
                        var key = keys[i];
                        result[key] = deepClone(obj[key]);
                    }
                    return result;
                }

            default:
                {
                    throw new Error("Unable to copy obj! Its type isn‘t supported.");
                }
        }
    }