JavaScript替换一个或另一个

Question

I'm trying to make the replace function work when having one match or another. It's very simple as a logic so I'd like to have a very simple implementation.

I have tried:

var my_url = document.URL;
var tmpl = "?tmpl=component" || "&tmpl=component"; //This is the tricky part
location.href = my_url.replace(tmpl,"");

...but it doesn't seem to work. Any ideas please?

Answer 1

This is not how JavaScript works, logical OR is useless here. One possible way is using regex :

location.href = my_url.replace(/[?&]tmpl=component/, "");

Here the replace method will replace any match of tmpl=component starting with either ? or & .

Answer 2

You could do two replacements:

location.href = my_url.replace("?tmpl=component", "").replace("&tmpl=component", "");

or you could use a regular expression: (recommended)

location.href = my_url.replace(/[?&]tmpl=component/, "");

[?&] will match either a '?' or '&' character.

Answer 3

You're setting tmpl to be the value of the expression "?tmpl=component" || "&tmpl=component"; "?tmpl=component" || "&tmpl=component"; , which will always evaluate to "?tmpl=component" , since it is the first truthy value in your or statement.

You can do this with regex in a number of ways:

my_url.replace(/?tmpl=component|&tmpl=component/, "");
my_url.replace(/[?&]tmpl=component/, "");

Answer 4

最好的是：

 var tmpl = (my_url.indexOf("?tmpl=component") > -1)? "?tmpl=component" : "&tmpl=component";