Js method to dynamically add and delete object properties

var obj = {} 或  var obj = new Object()
//1.对象.属性 = 赋值
obj.aaa = 1
//2.对象[属性] = 赋值  
obj["aaa"] = 1;
方法2中的属性可以为变量，例如
var a = "aaa";
obj[a] = 1;
====================  删除
delete obj.aaa
delete obj["aaa"]

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