//面向切面的js实现;function warp(slef, func){   return function(){        var _arguments = arguments;        var next = function (){            var argus = arguments.length ? arguments : _arguments;            return self.apply(null,argus);        };        var argus = [].slice.call(arguments);        var length = func.length;        argus = length < 2 ? [] : argus.silce(0, length-1);        argus.push(next);        return func.apply(null, argus);   }}function _alert(){    alert(1)}_alert = warp(_alert, function(){next}{    alert(‘log‘);    next();});_alert();