是否有一个简单的方法来转换字符串标题大小写?例如,约翰·史密斯变成了约翰·史密斯。我不是在寻找像John Resig的解决方案那样复杂的东西,只是(希望)一些一两行代码。
当前回答
瓦尔·弦=“测试” 笨蛋。 var输出=弦。charAt(0) 控制台日志(输出)。 警报(输出)
var string = "tEsT"
string = string.toLowerCase()
string.charAt(0).toUpperCase() + string.slice(1)
string.charAt(0) returns the character at the 0th index of the string. toUpperCase() is a method that returns the uppercase equivalent of a string. It is applied to the first character of the string, returned by charAt(0). string.slice(1) returns a new string that starts from the 1st index (the character at index 0 is excluded) till the end of the string. Finally, the expression concatenates the result of toUpperCase() and string.slice(1) to create a new string with the first character capitalized.
其他回答
试试这个
String.prototype.toProperCase = function(){
return this.toLowerCase().replace(/(^[a-z]| [a-z]|-[a-z])/g,
function($1){
return $1.toUpperCase();
}
);
};
例子
var str = 'john smith';
str.toProperCase();
我用正则表达式回答。
更多regex信息:https://regex101.com/r/AgRM3p/1
function toTitleCase(string = '') { const regex = /^[a-z]{0,1}|\s\w/gi; string = string.toLowerCase(); string.match(regex).forEach((char) => { string = string.replace(char, char.toUpperCase()); }); return string; } const input = document.getElementById('fullname'); const button = document.getElementById('button'); const result = document.getElementById('result'); button.addEventListener('click', () => { result.innerText = toTitleCase(input.value); }); <!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta http-equiv="X-UA-Compatible" content="IE=edge"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <title>Test</title> </head> <body> <input type="text" id="fullname"> <button id="button">click me</button> <p id="result">Result here</p> <script src="./index.js"></script> </body> </html>
这是我的答案,如果你的问题解决了,请评论并点赞。
function toTitleCase(str) str归来。replace ( / (\ w * w * | w *) \ s * / g, 功能(. txt) { 三年级,四年级,三年级,四年级,三年级,三年级 的 ); 的 < form > 输入: <br /><textarea" > < / textarea > < br / >输出: <br /><textarea" > < / textarea > < / form >
一种方法使用减少
函数titleCase(str) { Const arr = str.split(" "); Const result = arr。Reduce ((acc, cur) => { const newStr = cur[0].toUpperCase() + cur.slice(1).toLowerCase(); 返回${newStr} }, " ") 返回的结果。片(0,result.length-1); }
健壮的函数式编程方式做标题大小写函数
Exaplin版本
function toTitleCase(input){
let output = input
.split(' ') // 'HOw aRe YOU' => ['HOw' 'aRe' 'YOU']
.map((letter) => {
let firstLetter = letter[0].toUpperCase() // H , a , Y => H , A , Y
let restLetters = letter.substring(1).toLowerCase() // Ow, Re, OU => ow, re, ou
return firstLetter + restLetters // conbine together
})
.join(' ') //['How' 'Are' 'You'] => 'How Are You'
return output
}
实现版本
function toTitleCase(input){
return input
.split(' ')
.map(i => i[0].toUpperCase() + i.substring(1).toLowerCase())
.join(' ')
}
toTitleCase('HoW ARe yoU') // reuturn 'How Are You'