JS 统计字符串中大小写字母个数
注：字母a-z的code为97 - 122，A-Z的code为65 - 90 这很重要。不过记不住也没关系
let str = 'naAZiHesnKuanzgA'console.log('a'.charCodeAt(), 'z'.charCodeAt(), 'A'.charCodeAt(), 'Z'.charCodeAt())//97 122 65 90function countABC(str) {let ABC = [];let abc = [];for (let i in str) {let code = str[i].charCodeAt()if (code > 96 && code < 123) {abc.push(str[i])} else if (code > 64 && code < 91) {ABC.push(str[i])}}console.log(abc.length, ABC.length)}countABC(str)
function countABC(str) {let strArr = Array.from(str)let ABC = [];let abc = [];strArr.forEach(item => {let code = item.charCodeAt()if (code >= 'a'.charCodeAt() && code <= 'z'.charCodeAt()) {abc.push(item)} else if (code >= 'A'.charCodeAt() && code <= 'Z'.charCodeAt()) {ABC.push(item)}})console.log(abc.length, ABC.length)}countABC(str)
两种方法，总之怎么开心怎么来
