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js如何把Utf编码串输出成文字?

function tt(str= '1f000'){
    return 'u{'+ str +'}'
    }
// 需要输出一成一个字符 '??' 出来。
要怎么弄呐?

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String.fromCodePoint(Number.parseInt('1f000', 16));

与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…
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