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写出如下代码的打印结果 #536

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Rashomon511 opened this issue Jul 4, 2019 · 0 comments

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Rashomon511 commented Jul 4, 2019

function changeObjProperty(o) {
  o.siteUrl = "http://www.baidu.com"
  o = new Object()
  o.siteUrl = "http://www.google.com"
} 
let webSite = new Object();
changeObjProperty(webSite);
console.log(webSite.siteUrl);

http://www.baidu.com
原因：函数的形参是值传递的，形参 o 的指向发生改变，指向堆内存中一个新的对象

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