Use JavaScript to get parameter values from URL

With the proliferation of Ajax, we sometimes need to get variables from the URL for user interaction. This function provides the method to obtain: function getquery (name) {var Reg = new Regexp ("(^ | &)" + name + "= ([^ &] *) (& | $)"); var r = Window. location. search. substr (1 ). match (REG); If (R! = NULL) return Unescape (R [2]); return NULL;} if you need to get the id value from the following address: http://71j.cn/a.php? A = My & id = 7 & M = 1 you only need to call getquery ("ID") on the current page.