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                ??一站式輕松地調用各大LLM模型接口,支持GPT4、智譜、豆包、星火、月之暗面及文生圖、文生視頻 廣告
                ``` <script tyle="text/javascript"> console.log(acb); var acb=100; console.log(acb); </script> ``` 效果圖: ![](https://img.kancloud.cn/43/5d/435d0240e152206c2a87c9111cc8cf94_891x234.png) 概述:各大瀏覽器廠商都有屬于自己的解析器,在翻譯代碼的時候,會將變量的聲明部分,提升到當前作用域的最上方。 解析器:各大瀏覽器廠商都有屬于自己的解析器。說白了,將你的代碼翻譯給瀏覽器,讓瀏覽器知道你寫的是什么。 作用于:書寫代碼的范圍。 一個變量如果只是聲明了,沒有賦值,默認初始值為undefined 當程序中出現變量,解析器做的第一件事,將變量的聲明部分,提升到當前作用域最上方。(賦值部分不會提升) ![](https://img.kancloud.cn/ef/0f/ef0f875711b588e0df44e50118367c06_1085x878.png)
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