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                ## **==和===的區別** **==** 1. 值比較,不用考慮左右兩邊類型,比較時要進行類型轉換(轉換方式如下) 2. 倘若有一邊的值為boolean,那么先將boolean-->number再比較 3. 倘若一邊為字符串,一邊為number,那么string-->number再比較 4. null==undefined 5. NaN與任何值計算,結果都為NaN 除非 NaN!=NaN-->true 6. null和undefined比較之前不能將其轉為其它類型 **===** 1. 安全等,左右兩邊的的值和類型完全相同才返回true 2. 比較時不需要轉換類型直接進行比較
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