将字符串的前后顺序翻转
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>Document</title> </head> <body> <script type="text/javascript"> var str = "hello world"; arr = str.split(""); // 将字符串转换成数组 arr.reverse(); // 前后顺序翻转 str2 = arr.join(""); // 将数组转换成字符串 console.log(str2); </script> </body> </html>