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sum 和"sum"的区别

加”“和没加”“或者‘  ’这三个的区别

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2 回答


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0 回复 有任何疑惑可以回复我~

“” 字符串,没加:变量,'' :“dkllksk'sum'd”理解为转义双引号

0 回复 有任何疑惑可以回复我~

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sum 和"sum"的区别

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