Question

即如果我有一个输入字符串：

input ='你好世界，怎么了？'

我想要一个输出字符串：

desiredOutput ='Hello World，whats up？'

如果字符串中任何单词的第一个字母已经是大写字母，请保持原样。

Answer 1

function upperCaseFirstLetter(string) {
    return string.charAt(0).toUpperCase() + string.slice(1);
}

function lowerCaseAllWordsExceptFirstLetters(string) {
    return string.replace(/\w\S*/g, function (word) {
        return word.charAt(0) + word.slice(1).toLowerCase();
    });
}

var input = 'hello World, whatS up?';
var desiredOutput = upperCaseFirstLetter(lowerCaseAllWordsExceptFirstLetters(input));

console.log(desiredOutput);

基于：

https://docs.oracle.com/javase/7/docs/api/java/lang/Object.html

和

How do I make the first letter of a string uppercase in JavaScript?

Answer 2

我试图做同样的事情，但发现了一种更简单的方法：

function formatString(str) {
  return str
  .replace(/(\B)[^ ]*/g,match =>(match.toLowerCase()))
  .replace(/^[^ ]/g,match=>(match.toUpperCase()));
}

var text = "aaa BBB CCC";
console.log(formatString(text));

Answer 3

using (var stream = model.ImageFile.OpenReadStream())
{
    Image originalImage = Image.FromStream(stream, true, true);

    //Create the cropbox
    Rectangle cropbox = new Rectangle(-5, -25, 400, 400) //these values are just examples, not constants

    //Crop image (won't work because cropbox is outside boundaries of the original image)
    Bitmap croppedBitmap = new Bitmap(originalImage).Clone(cropbox, PixelFormat.DontCare);
}

Answer 4

function titleCase(str) {
  return str.split(' ').map(item => 
         item.charAt(0).toUpperCase() + item.slice(1).toLowerCase()).join(' ');
}

console.log(titleCase("HERE IS MY HANDLE HERE IS MY SPOUT"));

//prints "Here Is My Handle Here Is My Spout";

更改str参数值，一切顺利。

小写字母表中的所有字母除了第一个字母和字母串的首字母大写？ -javascript

4 个答案: