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对《null和undefined的区别》的补充 #3

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对《null和undefined的区别》的补充#3
@hexuanzhang

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@hexuanzhang
hexuanzhang
opened on Mar 1, 2016

1.null是js的保留关键字，undefined是window对象的内置属性
2.null在参与数值运算时转换为0，undefined参与数值运算时为NaN

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