我试图写一个函数，大写字符串中每个单词的第一个字母(将字符串转换为标题情况)。
例如，当输入是“我是一个小茶壶”时，我期望“我是一个小茶壶”是输出。然而，该函数返回“i'm a little tea pot”。
这是我的代码:
函数标题案例（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（“ ”）; } 返回 str; } console.log（titleCase（“I'm a Little Teapot”））;
当前回答
最短的一行(也非常快):
text.replace(/(^\w|\s\w)/g, m => m.toUpperCase());
解释:
^\w:字符串的第一个字符 |:或 \s\w:空格后的第一个字符 (^\w|\s\w)捕捉模式。 g标志:匹配所有出现的情况。
如果你想确保剩下的是小写的:
text.replace(/(^\w|\s\w)(\S*)/g, (_,m1,m2) => m1.toUpperCase()+m2.toLowerCase())
使用示例:
几点toTitleCase = str = > str。replace (/ s (^ w | \ \ w) (s *) / g, (m1, m2) = >的m1 toUpperCase () + m2。toLowerCase () 控制台日志。(toTitleCase(“你好世界”);
其他回答
function titleCase(str) { //First of all, lets make all the characters lower case let lowerCaseString = ""; for (let i = 0; i < str.length; i++) { lowerCaseString = lowerCaseString + str[i].toLowerCase(); } //Now lets make the first character in the string and the character after the empty character upper case and leave therest as it is let i = 0; let upperCaseString = ""; while (i < lowerCaseString.length) { if (i == 0) { upperCaseString = upperCaseString + lowerCaseString[i].toUpperCase(); } else if (lowerCaseString[i - 1] == " ") { upperCaseString = upperCaseString + lowerCaseString[i].toUpperCase(); } else { upperCaseString = upperCaseString + lowerCaseString[i]; } i = i + 1; } console.log(upperCaseString); return upperCaseString; } titleCase("hello woRLD");
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();});
}
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.
你可以基于这个inputString[0].toUpperCase() + inputString.slice(1).toLowerCase():)
我已经使用下面的代码做到了这一点，希望它能帮助你:
<p id="p1">This is a paragraph.</p>
<script>
const capitalize = (mySentence) => {
const words = mySentence.split(" ");
for (let i = 0; i < words.length; i++) {
words[i] = words[i][0].toUpperCase() + words[i].substr(1);
}
return words.join(" ");
};
const result = capitalize('This is a sample text');
document.getElementById("p1").innerHTML = result;
</script>
