如何从javascript / jquery中的字符串中删除文本

Question

我有一个字符串

var urlString = $('#link1').attr('src');

但是，它看起来像这样：//mysite.com/image1_medium.jpeg？v = 1233301923

我想删除一些文字，以便urlString ==＆＃39; // mysite.com/image1.jpeg'

Answer 1

regular expression使用https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/replace

var url = "//mysite.com/image1_medium.jpeg?v=1233301923";
var newUrl = url.replace(/(.*)_medium(.*)\?.*/, "$1$2")

Answer 2

var new_url = old_url.substring(0, old_url.indexOf('?')).replace("_medium", "");