将一段话的每个单词首字母大写

// 将一个单词的首字母大写
 function wordUpperCase(word){
  var wLength = word.length;  
  if(wLength > 0){
   var ss = (word.substring(0,1).toUpperCase()) + (word.substring(1,wLength).toLowerCase()+" ");
  }
  return ss;
 }
 
 // 将一个句子的每个单词的首字母大写
 function sentenceUpperCase(sentence){
  var upperSentence = '';
  var array = sentence.split(' ');
  for(i = 0 ;i < array.length ; i++){
   upperSentence += wordUpperCase(array[i]);     
  }
  return upperSentence; 
 }