JS - Object and Property的删除用法

在JS中，Object和Property的删除用法：

 1 var myObject = {name:'jimmy', age:12, height:123}
 2 delete myObject["jimmy"];
 3 delete myObject.age;
 4 with (myObject) {
 5    delete height;
 6 }
 7 
 8 // and an object
 9 var myObject = new Object();
10 delete myObject;
11 
12 var myObj2 = {};
13 myObj2 = null;