js中ASCII码和字符互相转换的方法

十进制ASCII码转换成字符

  1. 使用String.fromCodePoint(num1[, ...[, numN]])方法
String.fromCharCode(65) // A
String.fromCharCode(90) // Z
String.fromCharCode(97) // a
String.fromCharCode(122) // z
  1. 也可使用String.fromCharCode(num1[, ...[, numN]])方法
String.fromCodePoint(65) // A
String.fromCodePoint(90) // Z
String.fromCodePoint(97) // a
String.fromCodePoint(122) // z

fromCodePoint(), fromCharCode()两个都是String的静态方法,因此直接使用,不须要实例化。
二者的主要区别是:
fromCharCode() 出现的早,能够处理经常使用的字符编码
fromCodePoint() ES2015出现的,能够处理高位编码。code

字符转换成十进制ASCII码

'A'.charCodeAt() // 65
'a'.charCodeAt() // 97
'Z'.charCodeAt() // 90
'z'.charCodeAt() // 122

参考:ip

  1. https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/fromCharCode
  2. https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/fromCodePoint
  3. https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/charCodeAt
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