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© Wendy0518 初级黑马   /  2019-6-20 19:57  /  756 人查看  /  0 人回复  /   0 人收藏 转载请遵从CC协议 禁止商业使用本文

in JS, within a function, if use the same variable name as defined in global before without var declaration, it means that you're using the same global variable and change its value. but in Python, within a function, you need to make a declaration as Global Variable.

in JS, Prefixing a variable with var defines a new variable. Omitting var updates an existing variable. (you should always use var to define a new variable)

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