var a = "website.html";
var name = a.split(".")[0];

如果文件名中带有点，您可以尝试...

If the file name has a dot in the name, you could try...

var a = "website.old.html";
var nameSplit = a.split(".");
nameSplit.pop();    
var name = nameSplit.join(".");

但是，如果文件名类似于 my.old.file.tar.gz ，则它将认为 my.old.file.tar 是文件名

But if the file name is something like my.old.file.tar.gz, then it will think my.old.file.tar is the file name