将字符串中的每个单词的首字母大写 - JavaScript

问题描述

这个功能有什么问题？我感谢你的帮助。

What is wrong with this function? I am lost thanks for help.

function titleCase(str) {
 var splitStr = str.toLowerCase().split(' ');
 for (var i = 0; i < splitStr.length; i++) {
   if (splitStr.length[i] < splitStr.length) {
     splitStr[i].charAt(0).toUpperCase();
   }
      str = splitStr.join(' ');
 }
return str;
}

titleCase("I'm a little tea pot");

推荐答案

您没有再次将更改分配给数组，所以你所有的努力都是徒劳的。试试这个：

You are not assigning your changes to the array again, so all your efforts are in vain. Try this:

function titleCase(str) {
   var splitStr = str.toLowerCase().split(' ');
   for (var i = 0; i < splitStr.length; i++) {
       // You do not need to check if i is larger than splitStr length, as your for does that for you
       // Assign it back to the array
       splitStr[i] = splitStr[i].charAt(0).toUpperCase() + splitStr[i].substring(1);
   }
   // Directly return the joined string
   return splitStr.join(' ');
}

document.write(titleCase("I'm a little tea pot"));

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