将JS中每个单词的首字母大写 [英] Capitalize first letter of each word in JS
本文介绍了将JS中每个单词的首字母大写的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我正在学习如何将字符串中每个单词的第一个字母大写,对于这个解决方案,我理解除了word.substr(1)部分之外的所有内容。我看到它正在添加破碎的字符串但是(1)如何工作?
I'm learning how to capitalize the first letter of each word in a string and for this solution I understand everything except the word.substr(1) portion. I see that it's adding the broken string but how does the (1) work?
function toUpper(str) {
return str
.toLowerCase()
.split(' ')
.map(function(word) {
return word[0].toUpperCase() + word.substr(1);
})
.join(' ');
}
console.log(toUpper("hello friend"))
推荐答案
返回值包含2部分:
return word[0].toUpperCase() + word.substr(1);
1) word [0] .toUpperCase()
:这是第一个大写字母
1) word[0].toUpperCase()
: It's the first capital letter
2) word.substr(1)
除了首字母已被资本化。这是 substr 如何运作的文件。
2) word.substr(1)
the whole remain word except the first letter which has been capitalized. This is document for how substr works.
如果你想调试,请参考下面的结果:
Refer below result if you want to debug:
function toUpper(str) {
return str
.toLowerCase()
.split(' ')
.map(function(word) {
console.log("First capital letter: "+word[0]);
console.log("remain letters: "+ word.substr(1));
return word[0].toUpperCase() + word.substr(1);
})
.join(' ');
}
console.log(toUpper("hello friend"))
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