Characters in a string are indexed from left to right. The index of the first character is 0, and the index of the last character in a string called stringName is stringName.length - 1. If the index you supply i
console.log(String.fromCharCode(189,43,190,61));// "½+¾="console.log(String.fromCharCode(97));// "a" https://developer.mozilla.org/zh-CN/docs/Web/JavaScript/Reference/Global_Objects/String/fromCharCode MDN API dcos charAt charAt() 方法从一个字符串中返回指定的字符。 str.charAt(inde...