標籤:parse ring string erro efi tor 實現 number fine
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內建類型的檢測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。