19 var target = {};  variable
20 var handler = { has (target) {  argument
24 var proxy = new Proxy(target, handler);
57 var target = {  variable
62   has: function(target, prop) {  argument
67 var proxy = new Proxy(target, handler);
72 var target = {  variable
78   has: function(target, prop) {  argument
82     return prop in target;
86 var proxy = new Proxy(target, handler);
92 var target = {  variable
96 var proxy = new Proxy(target, handler);
101 var target = {  variable
105 var proxy = new Proxy(target, handler);
110 var target = {  variable
114 var proxy = new Proxy(target, handler);
124 var target = {  variable
129   has: function(target, prop) {  argument
130     return prop in target;
134 var proxy1 = new Proxy(target, handler);
140 var target = {};
142 Object.defineProperty(target, "prop", {
148   has: function(target, prop) {  argument
153 var proxy = new Proxy(target, handler);
162 var target = { a: 10 };  variable
163 Object.preventExtensions(target);
165 var proxy = new Proxy(target, handler);