/*** js 将字符串反转*/function strReverse(str) {var tmp = str.split('');return (tmp.reverse()).join('');}console.log(strReverse('abcdef'))/*** js 将字符串中的大写变成小写,小写变成大写*/function strChange(arg) {var str=arg.split('');for(var i = 0; i < str.length; i++) {if (str[i].charCodeAt() >= 65 && str[i].charCodeAt() <= 90) {str[i] = str[i].toLowerCase();} else {str[i] = str[i].toUpperCase();}}return str.join('');}console.log(strChange('abcERdsQ2d'))
0 ~ 9 (Unicode编码值范围:48~57)
a ~ z(Unicode编码值范围:97~122)
A ~ Z(Unicode编码值范围:[65~90])