js 对象和数组的深拷贝

function cloneObj(obj) {
var newO = {};
if (obj instanceof Array) {
newO = [];
}
for(var key in obj) {
if(typeof obj[key] === "object") newO[key] = cloneObj(obj[key]);
else newO[key] = obj[key];
}
return newO;
}

//test

var o_obj = {"a":1,"b":2};
var n_obj = cloneObj(o_obj);
o_obj.a = 2;
console.log(n_obj);