Implementation of TrimStart, TrimEnd, and Trim on javascript in C#_javascript skills

So, I wrote it myself!! I saw many people using regular expressions, but I didn’t know how to do it, so I used the most primitive method to achieve it! Post the code! I hope it will be helpful to everyone!!!

Copy code The code is as follows:

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);
};

Everyone should know how to use it!!! I won’t go into details here!!! If you have any questions, please point them out! Thank you!