<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>字符串操作</title> </head> <body> <script type="text/javascript"> //声明字符串 var str = '@ilove@You@';// //获取字符串的长度 var len = str.length; // /常用的方法 var res = str.trim('@'); //获取指定索引的字符 $str[] $str{} var res = str.charAt(4);//char字符 at 在...地方 //strpos var res = str.indexOf('o'); //strrpos var res = str.lastIndexOf('o'); //连接字符串 + 想起arguments var res = str.concat('verymuch',' and you???'); //截取字符串 var res = str.slice(2, 7); var res = str.substring(2, 7); //字符串拆分 var res = str.split('@'); // console.log(res); //截取字符串 var res = str.substr(2, 4); //大写转换 var res = str.toUpperCase(); //小写转换 var res = str.toLowerCase(); //字符串替换 var res = str.replace('love','like'); // </script> </body> </html>