//布爾值轉數字
let a = true a * 1 = 1 +a = 1
let b = false b * 1 = 0 +b = 0
//數字轉布爾值
let c = 1 !!c = true
let d = 0 !!d = false
//布爾值轉數字
let a = true a * 1 = 1 +a = 1
let b = false b * 1 = 0 +b = 0
//數字轉布爾值
let c = 1 !!c = true
let d = 0 !!d = false
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