Javascript/charCodeAt

解説文字列の中の指定された位置にある文字の文字コードを返す

sample1Code

function range(first, last) {
	var first = first.charCodeAt(0);
	var last = last.charCodeAt(0);
	var result = new Array();
	for(var i = first; i <= last; i++) {
            result.push(String.fromCodePoint(i));
	}
	return result;
}
    
var alphabet = range('A', 'Z');
console.log(alphabet);

sample2

sample2code

function s2Func(){
  var s2Text = document.getElementById("s2Text").value;
  console.log(s2Text.charCodeAt(0));
}