javascript中null和undefined的区别? 绝地灬酷狼 2022-03-11 16:10 256阅读 0赞 1.类型不一样: typeof (undefined); //undefined typeof(null); //object 2.转化为值时不一样:undefined为NaN ,null为0 console.log(Number(undefined));//NaN console.log(Number(10+undefined));//NaN console.log(Number(null));//0 console.log(Number(10+null));//10 3.undefined===null;//false undefined==null;//true
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