深度克隆一个对象

function cloneObject( obj ) {
var str = '';
var newObj = obj.constructor === Array ? [] : {};

if ( typeof obj !== 'object') {
return ;
} else if( window.JSON) {
str = JSON.stringify(obj);
newObj = JSON.parse(str);
} else {
for ( var i in obj ) {
newObj[i] = typeof obj[i] === ' object ' ? arguments.callee.call( obj[i] ) : obj[i];
}
}
return newObj;
}

//for test
var p = [1, '2', [0, 1, 2], {a: 0, b: 1, c: 2}];
//clone
var np = cloneObject(p);
console.log(obj, arr, newobj, newarr, np);