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JavaScript: Clone Anything
function clone(src) {
function mixin(dest, source, copyFunc) {
var name, s, i, empty = {};
for(name in source){
// the (!(name in empty) || empty[name] !== s) condition avoids copying properties in "source"
// inherited from Object.prototype. For example, if dest has a custom toString() method,
// don't overwrite it with the toString() method that source inherited from Object.prototype
s = source[name];
if(!(name in dest) || (dest[name] !== s && (!(name in empty) || empty[name] !== s))){
dest[name] = copyFunc ? copyFunc(s) : s;
}
}
return dest;
}
if(!src || typeof src != "object" || Object.prototype.toString.call(src) === "[object Function]"){
// null, undefined, any non-object, or function
return src; // anything
}
if(src.nodeType && "cloneNode" in src){
// DOM Node
return src.cloneNode(true); // Node
}
if(src instanceof Date){
// Date
return new Date(src.getTime()); // Date
}
if(src instanceof RegExp){
// RegExp
return new RegExp(src); // RegExp
}
var r, i, l;
if(src instanceof Array){
// array
r = [];
for(i = 0, l = src.length; i < l; ++i){
if(i in src){
r.push(clone(src[i]));
}
}
// we don't clone functions for performance reasons
// }else if(d.isFunction(src)){
// // function
// r = function(){ return src.apply(this, arguments); };
}else{
// generic objects
r = src.constructor ? new src.constructor() : {};
}
return mixin(r, src, clone);
}
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