眾所周知，對象的深淺拷貝是工作中肯定會遇到的問題。所以，今天考慮寫個小的功能來記錄一下

//type:boolean,true-deep,true為深拷貝，
function extendCopy(type,item){
  if(typeof type != "boolean" || typeof item !=‘object‘){
     return  
  }
var newObj = item.constructor ==="Array" ?[]:{};
  if(type){
     if(window.JSON){
          return JSON.parse(JSON.stringify(item));
     }  
     
 
else{
        for(prop in item){
           if(getType(item[prop]) ==‘array‘ ||           getType(item[prop]==“object”)){
             newObj[prop]= extendCopy(type,item[prop]);
          }
          else{
             newObj[prop] = item[prop];
          }     
        }
     }  

 }    
else{
for (prop in
 
 item){
newObj[prop] = item[prop];
}
return newObj;

}

}

//實現js內置類型的檢測
function getType(o){
      var _toString=Object.prototype.toString;
      var _type={
                 "undefined":"undefined",
                 "number":"number",
                 "boolean":"boolean",
                 "string":"string",
                 
 
"[object Function]":"function",
                 "[object Array]":"array",
                 "[object RegExp]":"regexp",
                 "[object Date]":"date",
                 "[object Erroe]":"error"
        }
        return _type[typeof o]||_type[_toString.call(o)]||(o?"object":"null");
}    

js通過一個方法實現對象的深淺拷貝。