大家的数据类型

console.log (typeof (null)); ——object

console.log (typeof (undefined)); ——undefined

console.log (typeof (NaN)); ——number

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var str = “syr1993”;

console.log (typeof (str++)); ——number

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var str = “syr1993”;

console.log (typeof (str)); ——string

【JavaScript】数据类型