JavaScript笔记(JavaScript notes)

0. 对象的分类：

　　内建对象：由ES标准定义，如：Math String Number Boolean Function Object…

　　宿主对象：由JS运行环境提供，主要指浏览器，如：DOM  BOM

　　自定义对象：由开发人员新建的对象

1. 删除对象属性：

var obj = new Object();
obj.name = "tom";
obj.age = 20;
console.log(obj);
delete obj.name;
console.log(obj.name)；
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0. Classification of objects:

Built in object: defined by ES standard, such as math string number Boolean function object

Host object: provided by the JS running environment, mainly refers to the browser, such as Dom and BOM

Custom object: an object created by a developer

1. Delete object attribute:

var obj = new Object();
obj.name = "tom";
obj.age = 20;
console.log(obj);
delete obj.name;
console.log(obj.name)；