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); };