这里我使用了replace()函数。

function titleCase(str){
    return str.replace(/\w\S*/g, function(txt){return txt.charAt(0).toUpperCase() + txt.substr(1).toLowerCase();});
}

ECMAScript 6版本:

const toTitleCase =(短语)=> { 返回的短语 .toLowerCase () .split (' ') .map(word => word. charat (0).toUpperCase() + word.slice(1)) . join (' '); }; let result = toTitleCase('maRy have a lIttLe LaMb'); console.log(结果);

ECMA2017或ES8

const titleCase = (string) => { return string .split(' ') .map(word => word.substr(0,1).toUpperCase() + word.substr(1,word.length)) .join(' '); }; let result = titleCase('test test test'); console.log(result); Explanation: 1. First, we pass the string "test test test" to our function "titleCase". 2. We split a string on the space basis so the result of first function "split" will be ["test","test","test"] 3. As we got an array, we used map function for manipulation each word in the array. We capitalize the first character and add remaining character to it. 4. In the last, we join the array using space as we split the string by sapce.

@somethingthere有一个更紧凑(和现代)的重写方案:

let titleCase = (str => str. tolowercase()。(' ') . map(分裂 c => c. charat (0). touppercase () + c.substring(1))。加入(' ')); 文档。write(titleCase(“我是一个更小的茶壶”));

你可以使用现代的JS语法，这可以让你的生活更容易。以下是我针对给定问题的代码片段:

const capitalizeString = string =>字符串(' ')。map(item => item.replace(item. charat (0)， item. charat (0). touppercase())))。加入(' '); capitalizeString('你好!我是aditya shrivastwa')

这个例程将处理连字符的单词和带有撇号的单词。

function titleCase(txt) {
    var firstLtr = 0;
    for (var i = 0;i < text.length;i++) {
        if (i == 0 &&/[a-zA-Z]/.test(text.charAt(i)))
            firstLtr = 2;
        if (firstLtr == 0 &&/[a-zA-Z]/.test(text.charAt(i)))
            firstLtr = 2;
        if (firstLtr == 1 &&/[^a-zA-Z]/.test(text.charAt(i))){
            if (text.charAt(i) == "'") {
                if (i + 2 == text.length &&/[a-zA-Z]/.test(text.charAt(i + 1)))
                    firstLtr = 3;
                else if (i + 2 < text.length &&/[^a-zA-Z]/.test(text.charAt(i + 2)))
                    firstLtr = 3;
            }
        if (firstLtr == 3)
            firstLtr = 1;
        else
            firstLtr = 0;
        }
        if (firstLtr == 2) {
            firstLtr = 1;
            text = text.substr(0, i) + text.charAt(i).toUpperCase() + text.substr(i + 1);
        }
        else {
            text = text.substr(0, i) + text.charAt(i).toLowerCase() + text.substr(i + 1);
        }
    }
}

titleCase("pAt o'Neil's");
// returns "Pat O'Neil's";