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js怎么判断输入的字符长度以及输入的汉字,就下面的一样!在线等。

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let pattern = /^[u4e00-u9fa5]{1,10}$/g; //检测1-10位汉字
    pattern.test('啊啊啊啊啊');
    
let pattern = /^[u4e00-u9fa5]{1,250}$/g; //检测1-250位汉字
    pattern.test('啊啊啊啊啊');  

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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