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
下面的函数不改变字符串的任何其他部分，只是试图将所有单词的所有首字母(即通过正则表达式定义\w+)转换为大写。
这意味着它不一定会将单词转换为标题，而是完全按照问题的标题说的那样:“字符串中每个单词的首字母大写- JavaScript”
不要扯断绳子 通过等价于[A-Za-z0-9_]+的正则表达式\w+确定每个单词 只对每个单词的第一个字符应用String.prototype.toUpperCase()函数。
function first_char_to_uppercase(argument) {
return argument.replace(/\w+/g, function(word) {
return word.charAt(0).toUpperCase() + word.slice(1);
});
}
例子:
first_char_to_uppercase("I'm a little tea pot");
// "I'M A Little Tea Pot"
// This may look wrong to you, but was the intended result for me
// You may wanna extend the regex to get the result you desire, e.g., /[\w']+/
first_char_to_uppercase("maRy hAd a lIttLe LaMb");
// "MaRy HAd A LIttLe LaMb"
// Again, it does not convert words to Titlecase
first_char_to_uppercase(
"ExampleX: CamelCase/UPPERCASE&lowercase,exampleY:N0=apples"
);
// "ExampleX: CamelCase/UPPERCASE&Lowercase,ExampleY:N0=Apples"
first_char_to_uppercase("…n1=orangesFromSPAIN&&n2!='a sub-string inside'");
// "…N1=OrangesFromSPAIN&&N2!='A Sub-String Inside'"
first_char_to_uppercase("snake_case_example_.Train-case-example…");
// "Snake_case_example_.Train-Case-Example…"
// Note that underscore _ is part of the RegEx \w+
first_char_to_uppercase(
"Capitalize First Letter of each word in a String - JavaScript"
);
// "Capitalize First Letter Of Each Word In A String - JavaScript"
编辑2019-02-07:如果你想要真正的标题(即只有第一个字母大写，其他字母小写):
function titlecase_all_words(argument) {
return argument.replace(/\w+/g, function(word) {
return word.charAt(0).toUpperCase() + word.slice(1).toLowerCase();
});
}
显示两者的例子:
test_phrases = [
"I'm a little tea pot",
"maRy hAd a lIttLe LaMb",
"ExampleX: CamelCase/UPPERCASE&lowercase,exampleY:N0=apples",
"…n1=orangesFromSPAIN&&n2!='a sub-string inside'",
"snake_case_example_.Train-case-example…",
"Capitalize First Letter of each word in a String - JavaScript"
];
for (el in test_phrases) {
let phrase = test_phrases[el];
console.log(
phrase,
"<- input phrase\n",
first_char_to_uppercase(phrase),
"<- first_char_to_uppercase\n",
titlecase_all_words(phrase),
"<- titlecase_all_words\n "
);
}
// I'm a little tea pot <- input phrase
// I'M A Little Tea Pot <- first_char_to_uppercase
// I'M A Little Tea Pot <- titlecase_all_words
// maRy hAd a lIttLe LaMb <- input phrase
// MaRy HAd A LIttLe LaMb <- first_char_to_uppercase
// Mary Had A Little Lamb <- titlecase_all_words
// ExampleX: CamelCase/UPPERCASE&lowercase,exampleY:N0=apples <- input phrase
// ExampleX: CamelCase/UPPERCASE&Lowercase,ExampleY:N0=Apples <- first_char_to_uppercase
// Examplex: Camelcase/Uppercase&Lowercase,Exampley:N0=Apples <- titlecase_all_words
// …n1=orangesFromSPAIN&&n2!='a sub-string inside' <- input phrase
// …N1=OrangesFromSPAIN&&N2!='A Sub-String Inside' <- first_char_to_uppercase
// …N1=Orangesfromspain&&N2!='A Sub-String Inside' <- titlecase_all_words
// snake_case_example_.Train-case-example… <- input phrase
// Snake_case_example_.Train-Case-Example… <- first_char_to_uppercase
// Snake_case_example_.Train-Case-Example… <- titlecase_all_words
// Capitalize First Letter of each word in a String - JavaScript <- input phrase
// Capitalize First Letter Of Each Word In A String - JavaScript <- first_char_to_uppercase
// Capitalize First Letter Of Each Word In A String - Javascript <- titlecase_all_words
其他回答
TypeScript肥箭头FTW
export const formatTitleCase = (string: string) =>
string
.toLowerCase()
.split(" ")
.map((word) => word.charAt(0).toUpperCase() + word.substring(1))
.join(" ");
试试这个函数:
const capitializeName = (name) => {
const splitName = name.split(' ');
const namesUpper = [];
for (const n of splitName) {
namesUpper.push(n[0].toUpperCase() + n.slice(1));
}
console.log(namesUpper.join(' '));
};
capitializeName('jahid bhuiyan');
function titleCase(str) {
var myString = str.toLowerCase().split(' ');
for (var i = 0; i < myString.length; i++) {
var subString = myString[i].split('');
for (var j = 0; j < subString.length; j++) {
subString[0] = subString[0].toUpperCase();
}
myString[i] = subString.join('');
}
return myString.join(' ');
}
下面的函数不改变字符串的任何其他部分，只是试图将所有单词的所有首字母(即通过正则表达式定义\w+)转换为大写。
这意味着它不一定会将单词转换为标题，而是完全按照问题的标题说的那样:“字符串中每个单词的首字母大写- JavaScript”
不要扯断绳子 通过等价于[A-Za-z0-9_]+的正则表达式\w+确定每个单词 只对每个单词的第一个字符应用String.prototype.toUpperCase()函数。
function first_char_to_uppercase(argument) {
return argument.replace(/\w+/g, function(word) {
return word.charAt(0).toUpperCase() + word.slice(1);
});
}
例子:
first_char_to_uppercase("I'm a little tea pot");
// "I'M A Little Tea Pot"
// This may look wrong to you, but was the intended result for me
// You may wanna extend the regex to get the result you desire, e.g., /[\w']+/
first_char_to_uppercase("maRy hAd a lIttLe LaMb");
// "MaRy HAd A LIttLe LaMb"
// Again, it does not convert words to Titlecase
first_char_to_uppercase(
"ExampleX: CamelCase/UPPERCASE&lowercase,exampleY:N0=apples"
);
// "ExampleX: CamelCase/UPPERCASE&Lowercase,ExampleY:N0=Apples"
first_char_to_uppercase("…n1=orangesFromSPAIN&&n2!='a sub-string inside'");
// "…N1=OrangesFromSPAIN&&N2!='A Sub-String Inside'"
first_char_to_uppercase("snake_case_example_.Train-case-example…");
// "Snake_case_example_.Train-Case-Example…"
// Note that underscore _ is part of the RegEx \w+
first_char_to_uppercase(
"Capitalize First Letter of each word in a String - JavaScript"
);
// "Capitalize First Letter Of Each Word In A String - JavaScript"
编辑2019-02-07:如果你想要真正的标题(即只有第一个字母大写，其他字母小写):
function titlecase_all_words(argument) {
return argument.replace(/\w+/g, function(word) {
return word.charAt(0).toUpperCase() + word.slice(1).toLowerCase();
});
}
显示两者的例子:
test_phrases = [
"I'm a little tea pot",
"maRy hAd a lIttLe LaMb",
"ExampleX: CamelCase/UPPERCASE&lowercase,exampleY:N0=apples",
"…n1=orangesFromSPAIN&&n2!='a sub-string inside'",
"snake_case_example_.Train-case-example…",
"Capitalize First Letter of each word in a String - JavaScript"
];
for (el in test_phrases) {
let phrase = test_phrases[el];
console.log(
phrase,
"<- input phrase\n",
first_char_to_uppercase(phrase),
"<- first_char_to_uppercase\n",
titlecase_all_words(phrase),
"<- titlecase_all_words\n "
);
}
// I'm a little tea pot <- input phrase
// I'M A Little Tea Pot <- first_char_to_uppercase
// I'M A Little Tea Pot <- titlecase_all_words
// maRy hAd a lIttLe LaMb <- input phrase
// MaRy HAd A LIttLe LaMb <- first_char_to_uppercase
// Mary Had A Little Lamb <- titlecase_all_words
// ExampleX: CamelCase/UPPERCASE&lowercase,exampleY:N0=apples <- input phrase
// ExampleX: CamelCase/UPPERCASE&Lowercase,ExampleY:N0=Apples <- first_char_to_uppercase
// Examplex: Camelcase/Uppercase&Lowercase,Exampley:N0=Apples <- titlecase_all_words
// …n1=orangesFromSPAIN&&n2!='a sub-string inside' <- input phrase
// …N1=OrangesFromSPAIN&&N2!='A Sub-String Inside' <- first_char_to_uppercase
// …N1=Orangesfromspain&&N2!='A Sub-String Inside' <- titlecase_all_words
// snake_case_example_.Train-case-example… <- input phrase
// Snake_case_example_.Train-Case-Example… <- first_char_to_uppercase
// Snake_case_example_.Train-Case-Example… <- titlecase_all_words
// Capitalize First Letter of each word in a String - JavaScript <- input phrase
// Capitalize First Letter Of Each Word In A String - JavaScript <- first_char_to_uppercase
// Capitalize First Letter Of Each Word In A String - Javascript <- titlecase_all_words
这里我使用了三个函数toLowerCase()， toUpperCase()和replace(regex,replacer)
function titleCase(str) {
return str.toLowerCase().replace(/^(\w)|\s(\w)/g, (grp) => grp.toUpperCase());
}
titleCase(“我是一个小茶壶”);
