拷贝(深拷贝)

/** 深拷贝 */
objDeepCopy: function(source) {
    var sourceCopy = source instanceof Array ? [] : {};
    for (var item in source) {
        if (typeof source[item] === ‘object‘) {
            if (source[item] === null) {
                sourceCopy[item] = null;
            } else {
                sourceCopy[item] = this.objDeepCopy(source[item]);
            }
        } else {
            sourceCopy[item] = source[item];
        }
    }
    return sourceCopy;
},