测试代码:
<html><script>"use strict";function test(){Object.defineProperty(window, "_name", {get : function(){console.log("gett is called ") },set : function(newValue){debugger;console.log("_name is filled!!!!");},enumerable : true,configurable : true});for( var i = 0; i < 2; i++) console.log(i);window._name = "2";};test();</script>
通过第5行开始的Object.defineProperty, 给window全局对象的_name属性设置了一个set hook,这样每当该属性被update时,注册的set hook会自动被调用:
测试:
一旦第18行window._name = 2被执行:
set hook会自动触发:
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