C#_javascript 기술의 javascript에서 TrimStart, TrimEnd 및 Trim 구현

String.prototype.trimStart = function(trimStr){
if(!trimStr){return this;}
var temp = this;
while(true){
if(temp.substr(0,trimStr.length)! =trimStr){
break
}
temp = temp.substr(trimStr.length)
}
return temp;
String.prototype.trimEnd = function(trimStr){
if(!trimStr){return this;}
var temp = this
while(true){
if(temp.substr(temp.length-trimStr. length,trimStr.length)!= ​​TrimStr){
break;
}
temp = temp.substr(0,temp.length-trimStr.length)
}
return temp;
};
String.prototype.trim = function(trimStr){
var temp = TrimStr
if(!trimStr){temp=" ";}
return this.trimStart( temp).trimEnd(temp);
};