JavaScript基于遍历操作实现对象深拷贝功能示例

function getType(o){
 var _t;
 return ((_t = typeof(o)) == "object" ? o==null && "null" || Object.prototype.toString.call(o).slice(8,-1):_t).toLowerCase();
}
function extend(destination,source){
 for(var p in source){
 if(getType(source[p])=="array"||getType(source[p])=="object"){
 destination[p]=getType(source[p])=="array"?[]:{};
 arguments.callee(destination[p],source[p]);
 }else{
 destination[p]=source[p];
 }
 }
}
var test={
 a:"ss",
 b:"dd",
 c:[
 {d:"css",e:"cdd"},
 {
 m:"ff",
 n:[
 {kk:"11",jj:"22"},
 {ll:"44"}
 ]
 }
 ]
};
var test1={};
extend(test1,test);
console.log(test);
console.log(test1);
test1.c[1].n[0].kk="change"; //改变test1的c属性对象的d属性
console.log(test);
console.log(test1);
console.log(test.c[1].n[0]);
console.log(test1.c[1].n[0]);