js 常用hook

1. hook函数
   old_func = func
   func = function(arguments){
   // 自己的操作逻辑
   return old_func.apply(arguments)
   }
   func.prototype... = ....
   重写原型链，为了抹去hook痕迹

2. hook对象属性, 如：
   (function() {
   'use strict';
   var cookie_cache = document.cookie;
   Object.defineProperty(document, 'cookie', {
   get: function() {
   console.log(cookie_cache);
   return cookie_cache;
   },
   set: function(val) {
   debugger;
   var cookie = val.split(";")[0];
   var ncookie = cookie.split("=");
   var flag = false;
   var cache = cookie_cache.split(";");
   cache = cache.map(function(a){
   if (a.split("=")[0] === ncookie[0]){
   flag = true;
   return cookie;
   }
   return a;
   })
   cookie_cache = cache.join(";");
   if (!flag){
   cookie_cache += cookie + ";";
   }
   },
   });

})();