Unverified95% confidenceFactTime unknown
JavaScript提供了三种声明变量的方式：let、var和const
1
Sources
95%
Confidence
Long-term
Relevance
5/31/2026
First Seen
Sources
Related Entities
Related Claims
UnverifiedJavaScript中的分号是可选的66% similarUnverifiedJavaScript的var使用函数作用域而非块作用域66% similarUnverified对于var声明，JavaScript引擎会将声明提升但不提升赋值，因此在声明前访问变量会得到undefined而非报错63% similarUnverifiedJavaScript's basic data types include String, Number, Boolean, Array, and Object.58% similarUnverifiedJavaScript is a weakly typed (dynamically typed) language, and variables do not need to have their types declared in advance.57% similar
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