A question about jumping

$("body").on("click",".ser",function(){
            window.location.href = self.introduce
            // window.open(self.introduce,"_blank")
        })

Why does an open web page have the current url in front of it?
I want to open www.baidu.com
, but what I can open is http://192.168.51.16:8081/www.baidu.com

.
Sep.25,2021

self.introduce without http://, is considered a relative path.

MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1b3e87f-2c42a.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1b3e87f-2c42a.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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