JS收集:限制用户名
限制用户名
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function check(f)
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{
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var p=document.getElementById(f);
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if(!/^[a-zA-Z]{1}([a-zA-Z0-9]|[_]){2,15}$/.test(p.value))
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{
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alert("用户名必须由字母数字下划线构成,长度为3到16位");
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return false;
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}
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return true;
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}
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![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
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![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockEnd.gif)
限制只能输入中文:
([\u4e00-\u9fa5]){2.15}
限制输入2-15个汉字
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