JavaScript tests three methods of string substitution efficiency

The first direct regular expression is replaced once

replaceTrim1 (source) {  return  source. } Replace(/^\s|\s$/g,"");}

The second regular expression is replaced two times, first replaced before the replacement

replaceTrim2 (source) {     return  source. } Replace(/^\s*/,""). Replace (/\s*$/,"");}

The third regular expression replaces the previous part, and the latter part loops through the

functionreplaceTrim3(source) {varStr= Source.Replace(/^\s*/,"");ws=/\s/;I=source.length; while(ws.Test(source.charAt(--I))){    };returnStr.Slice(0,I);}

/* 10000 short field: 10/18/47    "#id div.class test ok,fdfd,dfd,dfdfx,fdfd,dfdfdf,dfdfdf,dfdfd,jast  jfldf  fdfd DDF          "  */ = ""
varStartTime=NewDate ().GetTime(); for(varI=0;I<10000;I++){replaceTrim1(Source);}varEndtime=NewDate ().GetTime();;Console.Log("replaceTrim1 use time="+(Endtime-StartTime))StartTime=NewDate ().GetTime(); for(varI=0;I<10000;I++){replaceTrim2(Source);}Endtime=NewDate ().GetTime();; console. Log ("replaceTrim2use time="+ (endtime-starttime))StartTime=NewDate ().GetTime(); starttime = new Date (). GetTime ();
 for(varI=0;I<10000;I++){replaceTrim3(Source);}Endtime=NewDate ().GetTime();;  Console. Log ("replaceTrim2use time="+ (endtime-starttime ) )starttime = new Date (). GetTime ();
The final time is:
This is a short field, now in the long text to do processing, from the text inside the data to read the processing, the text size 4KB
 functionReadFile(path) {varoFSO,ofile,SFile,scontent;SFile="D:\\Tool\\11.txt ";//write file            oFSO=NewActiveXObject("Scripting.FileSystemObject");//ofile = Ofso.opentextfile (sfile,2,true);//write Open//Ofile.writeline ("Bodhi Tree, Mirror also not Taiwan, there is nothing, where to provoke dust!");//Ofile.close ();//Read file            ofile=oFSO. OpenTextFile (SFile,1);//read-only mode open            Try{ while(true) {varTemp=ofile. ReadLine ();scontent= (scontent==NULL?"" : (scontent+"</br>")) +Temp; }            }Catch(e) {if(e=="Error: input exceeded end of file")//Read the file normally,                {                }Else{//Other anomalies                    Alert(e)}}ofile. Close ();returnscontent; }
If you run an error while reading the file  : Automation server cannot create object
Self--->activex control and plug-in security-------Customize the level of the Internet option to enable activex....--> selection that is not marked as safe to execute scripts
The results of this implementation are:
Run 1000 times,
Separate time:
85/73/8
How is the last method of data more time instead of how much, this do not know.

JavaScript tests three methods of string substitution efficiency