JS首字母大写

function capitalize(string) {
  return string.charAt(0).toUpperCase() + string.slice(1);
}
capitalize("abc"); // Abc

String.prototype.capitalized = function () {
  return this.charAt(0).toUpperCase() + this.slice(1);
};
"abc".capitalized(); // Abc

参考

• 首字母大写: https://stackoverflow.com/questions/1026069/how-do-i-make-the-first-letter-of-a-string-uppercase-in-javascript?page=2&tab=scoredesc#tab-top