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JavaScript条件分岐

function isTarget(str: string | undefined) { return str === 'target'; } function returnStr(str: string | undefined) { return isTarget(str) ? 'ok' : str || 'ng'; } const str = undefined; console.log(returnStr(str)); const str2 = 'Hello'; console.log(returnStr(str2)); const str3 = 'ok'; console.log(returnStr(str3));