我如何转换字符串既像'helloThere'或'helloThere'到'HelloThere'在JavaScript?
当前回答
连续大写单词的最兼容的答案是:
常量文本 = 'theKD'; const result = text.replace(/([A-Z]{1,})/g, “$1”); const finalResult = result.charAt(0).toUpperCase() + result.slice(1); 控制台.log(最终结果);
它也与KD兼容,不会将其转换为KD。
其他回答
上面的答案对我来说都不完美,所以我不得不带着自己的自行车:
function camelCaseToTitle(camelCase) {
if (!camelCase) {
return '';
}
var pascalCase = camelCase.charAt(0).toUpperCase() + camelCase.substr(1);
return pascalCase
.replace(/([a-z])([A-Z])/g, '$1 $2')
.replace(/([A-Z])([A-Z][a-z])/g, '$1 $2')
.replace(/([a-z])([0-9])/gi, '$1 $2')
.replace(/([0-9])([a-z])/gi, '$1 $2');
}
测试用例:
null => ''
'' => ''
'simpleString' => 'Simple String'
'stringWithABBREVIATIONInside => 'String With ABBREVIATION Inside'
'stringWithNumber123' => 'String With Number 123'
'complexExampleWith123ABBR890Etc' => 'Complex Example With 123 ABBR 890 Etc'
这是我的版本。它在每个小写英文字母后面的大写英文字母之前增加一个空格,如果需要,还会将第一个字母大写:
例如: This IsCamelCase——> This IsCamelCase 这是骆驼案——>这是骆驼案 This IsCamelCase123——>
function camelCaseToTitleCase(camelCase){
if (camelCase == null || camelCase == "") {
return camelCase;
}
camelCase = camelCase.trim();
var newText = "";
for (var i = 0; i < camelCase.length; i++) {
if (/[A-Z]/.test(camelCase[i])
&& i != 0
&& /[a-z]/.test(camelCase[i-1])) {
newText += " ";
}
if (i == 0 && /[a-z]/.test(camelCase[i]))
{
newText += camelCase[i].toUpperCase();
} else {
newText += camelCase[i];
}
}
return newText;
}
基于上面的一个例子,我想出了这个:
const camelToTitle = (camelCase) => camelCase
.replace(/([A-Z])/g, (match) => ` ${match}`)
.replace(/^./, (match) => match.toUpperCase())
.trim()
它适用于我,因为它使用.trim()来处理边缘情况,其中第一个字母是大写的,并且您最终有一个额外的前导空格。
参考: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/Trim
我没有尝试每个人的答案,但我修补过的几个解决方案并不能满足我所有的要求。
我想出了一个办法…
export const jsObjToCSSString = (o={}) =>
Object.keys(o)
.map(key => ({ key, value: o[key] }))
.map(({key, value}) =>
({
key: key.replace( /([A-Z])/g, "-$1").toLowerCase(),
value
})
)
.reduce(
(css, {key, value}) =>
`${css} ${key}: ${value}; `.trim(),
'')
如果你处理的是大写骆驼的情况,这个片段可以帮助你,它还包含一些规格,所以你可以确保它适合你的情况。
export const fromCamelCaseToSentence = (word) =>
word
.replace(/([A-Z][a-z]+)/g, ' $1')
.replace(/([A-Z]{2,})/g, ' $1')
.replace(/\s{2,}/g, ' ')
.trim();
和规格:
describe('fromCamelCaseToSentence', () => {
test('does not fall with a single word', () => {
expect(fromCamelCaseToSentence('Approved')).toContain('Approved')
expect(fromCamelCaseToSentence('MDA')).toContain('MDA')
})
test('does not fall with an empty string', () => {
expect(fromCamelCaseToSentence('')).toContain('')
})
test('returns the separated by space words', () => {
expect(fromCamelCaseToSentence('NotApprovedStatus')).toContain('Not Approved Status')
expect(fromCamelCaseToSentence('GDBState')).toContain('GDB State')
expect(fromCamelCaseToSentence('StatusDGG')).toContain('Status DGG')
})
})