String对象
match()找到一个或多个正则表达式的匹配
substr()从起始索引号提取字符串中指定数目的字符
substring()提取字符串中两个指定的索引号之间的字符
<!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title>String对象</title> <script> var str = "-a-b-c-d-e-f-"; var str1 = str.substr(2, 4); //-b-c var str2 = str.substring(2, 4); //-b alert(str2); </script> </head> <body> </body> </html>