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JS中in和typeof和instanceof的含义和作用
JS中in和typeof和instanceof的含义和作用
typeof它是一个函数或是一个语言结构。typeof(a)、 typeof a; 用于判断变量的数据类型。
in – 用于判断下标是否存在数组中,或判断对象中是否有哪个成员
instanceof – 判断对象的原型
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原文地址:https://www.cnblogs.com/phpisfirst/p/9792581.html
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