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var obj = {a:10};
function copy(obj){
    var newobj = {};
    for ( var attr in obj) {
        newobj[attr] = obj[attr];
    }
    return newobj;
}
var obj2 = copy(obj);
obj2.a = 20;
alert(obj.a); //10  
var obj = {a:{b:10}};
function copy(obj){
    var newobj = {};
    for ( var attr in obj) {
        newobj[attr] = obj[attr];
    }
    return newobj;
}
var obj2 = copy(obj);
obj2.a.b = 20;
alert(obj.a.b); //20  
var obj = {a:{b:10}};
function deepCopy(obj){
    if(typeof obj != 'object'){
        return obj;
    }
    var newobj = {};
    for ( var attr in obj) {
        newobj[attr] = deepCopy(obj[attr]);
    }
    return newobj;
}
var obj2 = deepCopy(obj);
obj2.a.b = 20;
alert(obj.a.b); //10