js读取href中的参数函数

function GetQueryValue (queryName) {
	var query = decodeURI(window.location.search.substring(1));
	var vars = query.split("&");
	for (var i = 0; i < vars.length; i++) {
		var pair = vars[i].split("=");
		if (pair[0] == queryName) { return pair[1]; }
	}
	return null;
}