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in Technique[技术] by (71.8m points)

var a ; a&&a.c==1 为什么不报错?

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优先级   . 大于== 大于&& 

按优先级解释, 为什么不先算 a.c==1  ?

符号优先级

image.png


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你不能只看运算符,你的看表达式, && 后面是一个表达式, xxx && xxxx 是一个表达式,两个表达式怎么能一起算优先级?


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