js 克隆一个对象或数组

function cloneFun(obj){
if(!obj||"object" != typeof obj){
return null;
}
var result = (obj instanceof Array)?[]:{};
for(var i in obj){
result[i] = ("object" != typeof obj[i])?obj[i]:cloneFun(obj[i]);
}
return result;
}

var objTest = {
param1:{
p1:1,
p2:2,
p3:3
},
param2:4,
param3:5
};
var arrTest = [1,[2,3,4],5];
var objResult = cloneFun(objTest);
var arrResult = cloneFun(arrTest);