String.prototype.ucfirst=函数(notrim){ s=无边缘? this:this.replace(/(?:(?:^|\n)\s+|\s+(?:$|\n))/g,'')。replace(/\s+/g,''); 返回s.length>0? s.charAt(0).toUpperCase()+s.slice(1):s; }
'pizza'.ucfirst()=>'pizza' 'pizza'.ucfirst()=>'pizza' 'pizza'.ucfirst(true)=>“pizza”