執(zhí)行constructor后的結(jié)果是一個對象,而執(zhí)行typeof后的結(jié)果是一個字符串。看下表的對比:
變量 | typeof 變量 | 變量.constructor |
{a:"b"} | "object" | Object |
["a","b"] | "object" | Array |
function(){} | "function" | Function |
"a" | "string" | String |
66 | "number" | Number |
true | "boolean" | Boolean |
new User() | "object" | User |
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