Js randomly generates 26 uppercase/lowercase letters and js26 lowercase letters

Js randomly generates 26 uppercase/lowercase letters and js26 lowercase letters

First, we will introduce JavaScript to generate 26 uppercase and lowercase letters, mainly using the str. charCodeAt () and String. fromCharCode () methods.

1. UseCharCodeAt ()To obtain the Unicode encoding of a specific character in a string.
2,FromCharCode ()You can accept one or more specified Unicode values, and then return the corresponding string.

// Generate the Unicode value of uppercase letter A as 65 function generateBig_1 () {var str = []; for (var I = 65; I <91; I ++) {str. push (String. fromCharCode (I);} return str;} // generate the Unicode value of uppercase letter a as 97 function generateSmall_1 () {var str = []; for (var I = 97; I <123; I ++) {str. push (String. fromCharCode (I);} return str;} // convert the string to the Unicode code function toUnicode (str) {var codes = []; for (var I = 0; I <str. length; I ++) {codes. push (str. charCodeAt (I);} return codes;} function generateSmall () {var ch_small = 'a'; var str_small = ''; for (var I = 0; I <26; I ++) {str_small + = String. fromCharCode (ch_small.charCodeAt (0) + I);} return str_small;} function generateBig () {var ch_big = 'a'; var str_big = ''; for (var I = 0; I <26; I ++) {str_big + = String. fromCharCode (ch_big.charCodeAt (0) + I);} return str_big;} console. log (generateBig (); console. log (generateSmall (); console. log (toUnicode (generateBig (); console. log (toUnicode (generateSmall (); console. log (generateBig_1 (); console. log (generateSmall_1 ());

The following describes how to randomly generate 26 uppercase/lowercase letters and key lines of code for javascript:

function getCharacter(flag){  var character="";  if(flag==="lower"){  character = String.fromCharCode(Math.floor(Math.random()*26)+"a".charCodeAt(0));  }  if(flag==="upper"){  character = String.fromCharCode(Math.floor(Math.random()*26)+"A".charCodeAt(0));  }  return character; } function getUpperCharacter(){  return getCharacter("upper");; }function getLowerCharacter(){  return getCharacter("lower");; } console.log(getUpperCharacter());console.log(getLowerCharacter());

The above Code meets our requirements and can randomly output uppercase or lowercase letters. The principle is very simple, that is, the use of the range of uppercase or lowercase letters Unicode code.

Code 2:

/*** Return a random lowercase letter */function getLowerCharacter () {return getCharacter ("lower ");;} /*** return a random uppercase letter */function getUpperCharacter () {return getCharacter ("upper ");;} /*** returns a letter */function getCharacter (flag) {var character = ""; if (flag = "lower") {character = String. fromCharCode (Math. floor (Math. random () * 26) + "". charCodeAt (0);} if (flag = "upper") {character = String. fromCharCode (Math. floor (Math. random () * 26) + "". charCodeAt (0);} return character ;}

This article describes how to use javascript to output random uppercase or lowercase letters, hoping to help you more or less.

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