Javascript hash replace error [duplicate]

问题:

This question already has an answer here:

• Replace method doesn't work 4 answers

What's the problem with this?

the hash is : #/search=hello/somethingelse/

window.location.hash.replace(/search=([^\/]*)/gi, "search=" + value);

EDIT:

I want to change just a specific part of the hash not the whole hash.

回答1:

hash.replace() does not actually change the hash, only return a value (as it is a String function). Try assigning that result, using:

window.location.hash = window.location.hash.replace(/search=([^\/]*)/gi, "search=" + value);

On the other hand, window.location.replace() is actually a function that changes the URL, but that does not work directly with regexes.

回答2:

Did you forget to assign it?

replace() is a String function and returns a new String object, it doesn't modify the original String.

window.location.hash = window.location.hash.replace(/search=([^\/]*)/gi, "search=" + value);

回答3:

JavaScript strings are immutable, I believe. (a quick Google search shows that both SO and Wikipedia back me up)

This effectively means their value can't be changed without an assignment statement.

Hence, String.replace(...) doesn't change the String's value, but instead returns a new String.

var replaced = window.location.hash.replace(/search=([^\/]*)/gi, "search=" + value);

Now, since you are presumably trying to change the window.location.hash you're probably fishing for...

window.location.hash = window.location.hash.replace(/search=([^\/]*)/gi, "search=" + value);