如何將分詞轉換爲小寫

Question

如何將分詞轉換爲小寫？我有以下代碼。

var title = 'The Quick brown fox'; 
 

 
var titleCase = []; 
 

 

 
var Titlewords = title.split(""); 
 

 
for (var i = 0; i < Titlewords.length; i++) { 
 
    Titlewords[i].toLowerCase(); 
 

 
    console.log(Titlewords[i]); 
 

 
}

Answer 1

你只需要分配Titlewords[i].toLowerCase()回Titlewords[i]

var title = 'The Quick brown fox'; 
 

 
var titleCase = []; 
 

 

 
var Titlewords = title.split(""); 
 

 
for (var i = 0; i < Titlewords.length; i++) { 
 
Titlewords[i] = Titlewords[i].toLowerCase(); 
 

 
console.log(Titlewords[i]); 
 

 
}

Answer 2

你需要更新值

Titlewords[i] = Titlewords[i].toLowerCase(); 

var title = 'The Quick brown fox'; 
 

 
var titleCase = []; 
 

 

 
var Titlewords = title.split(""); 
 

 
for (var i = 0; i < Titlewords.length; i++) { 
 
    Titlewords[i] = Titlewords[i].toLowerCase(); 
 

 
    console.log(Titlewords[i]); 
 

 
}

Answer 3

str.toLowerCase()返回一個字符串，而不是將它降低。你想要做的是

Titlewords[i] = Titlewords[i].toLowerCase(); 

Answer 4

你可以做很多在JavaScript中沒有的東西自己編寫循環。這只是另一個例子。

const title = 'The Quick brown fox'; 
const words = title.split(' ').map(word => word.toLowerCase()); 

// print the array 
console.log(words); 

// print the single words 
words.forEach(word => console.log(word)); 

資源

• Array.prototype.map()
• Array.prototype.forEach()
• Arrow functions