模拟jquery hash 写了个自己的版本

;(function($) {
	$.extend({
		hash : function(name , value) {
			function isString(str) {
				return typeof str == 'string' && Object.prototype.toString.call(str) === '[object String]';
			}
			if(!isString(name) || $.trim(name) == '') return;
			var reg = new RegExp("[&|#]" + name + "=([^&]*)" , "i");
			var hash = location.hash;
			if(value || value === null) {
				hash = hash.replace(reg , '').replace(/^[#|&]/ , '');
				if(value !== null) {
					//set a hash
					location.hash = hash == '' ? name + "=" + encodeURIComponent(value) : hash + "&" + name + "=" + encodeURIComponent(value) ; 
				} else {
					//delete a hash
					location.hash = hash;
				} 
			} else {
				//get a hash value
				if(reg.test(hash)) {
					return decodeURIComponent(RegExp.$1);
				} else {
					return '';
				}
			}
		}
	});  
})(jQuery);