JS gets the value of the URL parameter

Get URL parameter function
function getquerystring (name) {
var reg = new RegExp ("(^|&)" + name + "= ([^&]*) (&|$)");

The match () method retrieves the specified value within a string, or finds the match of one or more regular expressions
var r = window.location.search.substr (1). Match (REG);
if (r!=null) {
Return unescape (r[2]);
}else{
return null;
}
}

And if our url=http://www.qingwa.com?id=10&p=3

Then we can get the ID and P value directly through the function, as follows:

var id = getquerystring ("id");

var id = getquerystring ("P");

No matter how many parameters are appended to the URL, it can be obtained directly from the above function.

JS gets the value of the URL parameter