Steve
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Steve
function changeObjProperty(o) { o.siteUrl = "http://www.baidu.com" o = new Object() // 形参 o 的指向发生改变，指向堆内存中一个新的对象 o.siteUrl = "http://www.google.com" } let webSite = new Object(); changeObjProperty(webSite); console.log(webSite.siteUrl); //"http://www.baidu.com"