JavaScript gets the parameter value from the URL string

JavaScript from the URL string to get the parameter value, in the Ajax prevalence today, it is particularly important, because most of the Ajax is the need to pass the value, so as to better realize user interaction, then use JS to get URL string parameters, in fact, it is not difficult to enumerate a simple example, Look at the following function:

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;

}

The JS function above is the use of regular expressions to get the URL string parameters, such as the need to get the ID value from the A.php?a=my&id=2233&m=ok, then combined with the above function, you can call the current page getquery ("id") can be.