获取自身url地址参数

 function getHash(key, url) {
	var hash;
	if (!!url) {
		hash = url.replace(/^.*?[#](.+?)(?:\?.+)?$/, "$1");
		hash = (hash == url) ? "" : hash;
	} else {
		hash = self.location.hash;
	}

	hash = "" + hash;
	hash = hash.replace(/^[?#]/, ‘‘);
	hash = "&" + hash;
	var val = hash.match(new RegExp("[\&]" + key + "=([^\&]+)", "i"));
	if (val == null || val.length < 1) {
		return null;
	} else {
		return decodeURIComponent(val[1]);
	}
}