将字符转为ASCII码
var str = "A";
str.charCodeAt(); // var str1 = 'a';
str1.charCodeAt(); //
将ASCII码转为字符
var num = 97;
String.fromCharCode(num); // 'a' var num1 = 100;
String.fromCharCode(num1); // 'd'
参考文章: http://blog.csdn.net/xiaobing_hope/article/details/78645273
fromCharCode