//面试题：如何把一句英文每个单词首字母大写？

                var str="what fuck is 1235 going on ?";

                var arr=str.split(" ");

                for(var i=0,newArr=[],sumArr=[];i<arr.length;i++){

                     var news=arr[i][0].toUpperCase();

                     newArr.push(news);

                     var sums=arr[i].slice(1);

                     sumArr.push(sums);

                     arr[i]=newArr[i]+sumArr[i];

                }

                 str=arr.join(" ");

                 console.log(arr,str);//["What", "Fuck", "Is", "1235", "Going", "On", "?"] "What Fuck Is 1235 Going On ?"