I saw someone else writing in a vue project:

  // 如果从详情返回并且之前存有对应的查询条件和参数
            // 则直接渲染之前的数据
            if (window.window.sessionStorage.searchKey && window.window.sessionStorage.tab === this.searchKey.tab) {
                this.topics = JSON.parse(window.window.sessionStorage.topics);
                this.searchKey = JSON.parse(window.window.sessionStorage.searchKey);
            //  下一个dom 更新序列之后再执行函数
                this.$nextTick(
                  () => $(window).scrollTop(window.window.sessionStorage.scrollTop)
                );
            } else {
                this.getTopics();
            }

Why does window.window.sessionStorage here add two windows?
It stands to reason that the result of window.window.sessionStorage=== window.sessionStorage is true. What considerations does the author have in writing this?

w3c says this:

The window.window property is equivalent to the self property, which contains a reference to the window itself.

window.window What other application scenarios are there for writing like this?