一个超级简单的方法，使用turboCommons库:

npm install turbocommons-es5

<script src="turbocommons-es5/turbocommons-es5.js"></script>

<script>
    var StringUtils = org_turbocommons.StringUtils;
    console.log(StringUtils.formatCase('EquipmentClass', StringUtils.FORMAT_LOWER_CAMEL_CASE));
    console.log(StringUtils.formatCase('Equipment className', StringUtils.FORMAT_LOWER_CAMEL_CASE));
    console.log(StringUtils.formatCase('equipment class name', StringUtils.FORMAT_LOWER_CAMEL_CASE));
    console.log(StringUtils.formatCase('Equipment Class Name', StringUtils.FORMAT_LOWER_CAMEL_CASE));
</script>

你也可以使用StringUtils。FORMAT_CAMEL_CASE和StringUtils。FORMAT_UPPER_CAMEL_CASE生成首字母大小写的变化。

更多信息:

将字符串转换为驼峰，UpperCamelCase或lowerCamelCase

因为这个问题还需要另一个答案……

我尝试了之前的几种解决方案，它们都有这样或那样的缺陷。有些没有删除标点符号;有些人不处理有数字的案件;有些人不能处理连续多个标点符号。

它们都没有处理a12b这样的字符串。对于这种情况，没有明确定义的约定，但其他一些stackoverflow问题建议用下划线分隔数字。

我怀疑这是性能最好的答案(三个regex通过字符串，而不是一个或两个)，但它通过了我能想到的所有测试。不过，老实说，我真的无法想象有一种情况，您执行了如此多的驼峰式转换，以至于性能会变得很重要。

(我添加了一个npm包。它还包括一个可选的布尔参数，以返回Pascal Case而不是Camel Case。)

const underscoreRegex = /(?:[^\w\s]|_)+/g,
    sandwichNumberRegex = /(\d)\s+(?=\d)/g,
    camelCaseRegex = /(?:^\s*\w|\b\w|\W+)/g;

String.prototype.toCamelCase = function() {
    if (/^\s*_[\s_]*$/g.test(this)) {
        return '_';
    }

    return this.replace(underscoreRegex, ' ')
        .replace(sandwichNumberRegex, '$1_')
        .replace(camelCaseRegex, function(match, index) {
            if (/^\W+$/.test(match)) {
                return '';
            }

            return index == 0 ? match.trimLeft().toLowerCase() : match.toUpperCase();
        });
}

测试用例(开玩笑)

test('Basic strings', () => {
    expect(''.toCamelCase()).toBe('');
    expect('A B C'.toCamelCase()).toBe('aBC');
    expect('aB c'.toCamelCase()).toBe('aBC');
    expect('abc      def'.toCamelCase()).toBe('abcDef');
    expect('abc__ _ _def'.toCamelCase()).toBe('abcDef');
    expect('abc__ _ d_ e _ _fg'.toCamelCase()).toBe('abcDEFg');
});

test('Basic strings with punctuation', () => {
    expect(`a'b--d -- f.h`.toCamelCase()).toBe('aBDFH');
    expect(`...a...def`.toCamelCase()).toBe('aDef');
});

test('Strings with numbers', () => {
    expect('12 3 4 5'.toCamelCase()).toBe('12_3_4_5');
    expect('12 3 abc'.toCamelCase()).toBe('12_3Abc');
    expect('ab2c'.toCamelCase()).toBe('ab2c');
    expect('1abc'.toCamelCase()).toBe('1abc');
    expect('1Abc'.toCamelCase()).toBe('1Abc');
    expect('abc 2def'.toCamelCase()).toBe('abc2def');
    expect('abc-2def'.toCamelCase()).toBe('abc2def');
    expect('abc_2def'.toCamelCase()).toBe('abc2def');
    expect('abc1_2def'.toCamelCase()).toBe('abc1_2def');
    expect('abc1 2def'.toCamelCase()).toBe('abc1_2def');
    expect('abc1 2   3def'.toCamelCase()).toBe('abc1_2_3def');
});

test('Oddball cases', () => {
    expect('_'.toCamelCase()).toBe('_');
    expect('__'.toCamelCase()).toBe('_');
    expect('_ _'.toCamelCase()).toBe('_');
    expect('\t_ _\n'.toCamelCase()).toBe('_');
    expect('_a_'.toCamelCase()).toBe('a');
    expect('\''.toCamelCase()).toBe('');
    expect(`\tab\tcd`.toCamelCase()).toBe('abCd');
    expect(`
ab\tcd\r

-_

|'ef`.toCamelCase()).toBe(`abCdEf`);
});

这建立在CMS的答案上，通过删除包括下划线在内的任何非字母字符，\w不会删除这些字符。

function toLowerCamelCase(str) {
    return str.replace(/[^A-Za-z0-9]/g, ' ').replace(/^\w|[A-Z]|\b\w|\s+/g, function (match, index) {
        if (+match === 0 || match === '-' || match === '.' ) {
            return ""; // or if (/\s+/.test(match)) for white spaces
        }
        return index === 0 ? match.toLowerCase() : match.toUpperCase();
    });
}

toLowerCamelCase("EquipmentClass name");
toLowerCamelCase("Equipment className");
toLowerCamelCase("equipment class name");
toLowerCamelCase("Equipment Class Name");
toLowerCamelCase("Equipment-Class-Name");
toLowerCamelCase("Equipment_Class_Name");
toLowerCamelCase("Equipment.Class.Name");
toLowerCamelCase("Equipment/Class/Name");
// All output e

以下是我的建议:

function toCamelCase(string) {
  return `${string}`
    .replace(new RegExp(/[-_]+/, 'g'), ' ')
    .replace(new RegExp(/[^\w\s]/, 'g'), '')
    .replace(
      new RegExp(/\s+(.)(\w+)/, 'g'),
      ($1, $2, $3) => `${$2.toUpperCase() + $3.toLowerCase()}`
    )
    .replace(new RegExp(/\s/, 'g'), '')
    .replace(new RegExp(/\w/), s => s.toLowerCase());
}

or

String.prototype.toCamelCase = function() {
  return this
    .replace(new RegExp(/[-_]+/, 'g'), ' ')
    .replace(new RegExp(/[^\w\s]/, 'g'), '')
    .replace(
      new RegExp(/\s+(.)(\w+)/, 'g'),
      ($1, $2, $3) => `${$2.toUpperCase() + $3.toLowerCase()}`
    )
    .replace(new RegExp(/\s/, 'g'), '')
    .replace(new RegExp(/\w/), s => s.toLowerCase());
};

测试用例:

describe('String to camel case', function() {
  it('should return a camel cased string', function() {
    chai.assert.equal(toCamelCase('foo bar'), 'fooBar');
    chai.assert.equal(toCamelCase('Foo Bar'), 'fooBar');
    chai.assert.equal(toCamelCase('fooBar'), 'fooBar');
    chai.assert.equal(toCamelCase('FooBar'), 'fooBar');
    chai.assert.equal(toCamelCase('--foo-bar--'), 'fooBar');
    chai.assert.equal(toCamelCase('__FOO_BAR__'), 'fooBar');
    chai.assert.equal(toCamelCase('!--foo-¿?-bar--121-**%'), 'fooBar121');
  });
});

简单容易理解这段代码，希望这对你有帮助，我用下面的逻辑解决了我的问题

// This example is for React Js User

const ConverToCamelCaseString = (StringValues)=> 
{
    let WordsArray = StringValues.split(" ");
    let CamelCaseValue = '';
    for (let index = 0; index < WordsArray.length; index++) 
    {
        let singleWord = WordsArray[index];
            singleWord.charAt(0).toUpperCase();
            singleWord =singleWord.charAt(0).toUpperCase() + singleWord.slice(1);

        CamelCaseValue +=" "+singleWord;
        
    }
    CamelCaseValue = CamelCaseValue.trim();
    return CamelCaseValue;
}

下面的例子是针对核心javaScript用户的

function ConverToCamelCaseString (StringValues) 
    {
        let WordsArray = StringValues.split(" ");
        let CamelCaseValue = '';
        for (let index = 0; index < WordsArray.length; index++) 
        {
            let singleWord = WordsArray[index];
                singleWord.charAt(0).toUpperCase();
                singleWord =singleWord.charAt(0).toUpperCase() + singleWord.slice(1);

            CamelCaseValue +=" "+singleWord;
            
        }
        CamelCaseValue = CamelCaseValue.trim();
        return CamelCaseValue;
    }

console.log(ConverToCamelCaseString("this is my lower case string")); 

我希望上面的例子能解决你的问题。

function convertStringToCamelCase(str){
    return str.split(' ').map(function(item, index){
        return index !== 0 
            ? item.charAt(0).toUpperCase() + item.substr(1) 
            : item.charAt(0).toLowerCase() + item.substr(1);
    }).join('');
}