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                ThinkChat2.0新版上線,更智能更精彩,支持會話、畫圖、視頻、閱讀、搜索等,送10W Token,即刻開啟你的AI之旅 廣告
                關鍵字和保留字不能作為標識符 ## js全部關鍵字 ![](https://box.kancloud.cn/e94427ab37c900e90571eb2ea449a38f_653x280.png) ## js全部保留字 ![](https://box.kancloud.cn/dcde08aafb93335dfce8f2ae76318ad1_691x304.png) 變量看做是一個盒子 var box=100; var box; //聲明變量,造一個盒子 100 //變量初始化 重復聲明,不會報錯,只是重新賦值,沒有必要。 ~~~ var box="aaa"; var box =100; ~~~
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