a = 0
b = 0 a === 0 && (a = 1,b = 2) a === 1 ? (a = 3,alert(b)) : (b = 4) a === 1 || alert(a)
b = 0
a === 0 && (a = 1,b = 2)
a === 1 ? (a = 3,alert(b)) : (b = 4)
a === 1 || alert(a)
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