JavaScript不可枚举的属性

Question

如何在对象上创建不可枚举的属性，以使其不会显示在for..in循环中，否则可以使用Object.property语法进行访问？

Answer 1

You can use Object.defineProperty for the task. Beside enumerable , you can also set writable and configurable (deletable) properties.

 var obj = {a: 1}; Object.defineProperty(obj, 'b', { value: 2, enumerable: false, }); console.log(obj.b); //2 for (var key in obj) { alert(key); //just 'a' }